Keep It Clean PDF - Infection Control and Biosecurity in Veterinary Medicine

Infection Control and Biosecurity in Veterinary Medicine 1 Keep It Clean Infection Control and Biosecurity in Veterinary Medicine BY THE NUMBERS Contents The importance of infection control and biosecurity 2 A brief history of disinfectants 2 7 Steps to go...

Infection Control and Biosecurity in Veterinary Medicine 1 Keep It Clean Infection Control and Biosecurity in Veterinary Medicine BY THE NUMBERS Contents The importance of infection control and biosecurity 2 A brief history of disinfectants 2 7 Steps to good infection control 6 9 Common disinfection mistakes 12 5 Disinfection myths 15 Small steps, big reasons 16 Glossary of disinfection and biosecurity terms 18 © 2017 American Animal Hospital Association (aaha.org). All rights reserved. ©istock.com/Trout55  Infection Control and Biosecurity in Veterinary Medicine 1 Infection prevention and biosecurity are an essential part of patient care and should play an important role in the daily practice of veterinary medicine. All veterinary practice team members, from veterinarians to kennel attendants, must maximize measures to prevent the spread of infectious pathogens as part of the care they provide to their patients and clients. An effective infection prevention and biosecurity program is an integral part of the One Health Initiative, a movement put into place to protect humans, animals, and the environment from the negative impact of pathogens. Infectious disease outbreaks are costly and have devastating short- and long-term effects for animal health professionals and animal care facilities. An infection control and biosecurity plan provides an established mechanism to protect against outbreaks and disease transmission, not just between animals but also between animals and those tasked with caring for them. Environmental surfaces, fomites, and medical devices play an important role in the transmission of pathogenic microorganisms, as many of these pathogens can survive on these surfaces for prolonged periods of time. Developing and implementing an effective infection prevention and biosecurity plan requires a committed team trained to execute a clear, sequential set of well-timed tasks, with each member having assigned areas of accountability. Cleaning and disinfection of environmental surfaces, fomites, and medical devices is a vital part of any facility’s infection prevention and biosecurity program. Choosing the right disinfectant can both ensure the overall success of a biosecurity program and have a dramatic impact on facility maintenance costs and employee health. This booklet will guide you in the selection of the ideal disinfectant and assist you in establishing and maintaining proper protocols to prevent the spread of pathogens within your facility. Developing an infection prevention and biosecurity program can be distilled into seven simple steps: 1. Clarifying the roles and responsibilities within your veterinary practice team 2. Identifying levels of biosecurity risk for different areas of your facility 3. Accounting for the mode of transmission for possible pathogens 4. Choosing the right disinfectant for your practice’s needs 5. Training your entire staff on proper use of the specific disinfectant you choose 6. Making the disinfectant you choose readily accessible 7. Setting up routine quality-control measures Lucas Pantaleon, DVM, MS, DACVIM, MBA Senior Clinical Veterinarian Advisor, Virox Animal Health A note from AAHA: AAHA recognizes the need for veterinary professionals to be educated about the most current research and information relative to infectious disease control and biosecurity. AAHA is working with Virox Animal Health to provide you with the most effective advice relative to biosecurity for veterinary practices. This booklet is the first of our communications and educational materials on this subject in the years to come. These materials will empower your practice’s infection prevention team to review and improve current protocols on a regular basis. We feel strongly that infectious disease prevention and control is important to veterinary medicine and the health of our pets. 2 Infection Control and Biosecurity in Veterinary Medicine The Importance of Infection Control and Biosecurity Comprehensive infection control and biosecurity play of approximately $4.12 million resulted from a single an increasingly important role in the daily practice of large outbreak of salmonellosis, which was attributed to veterinary medicine. an ineffective infection control program.1 Veterinary teams already make critical efforts toward In addition, the potential costs to clients also should not infection control. Using standards of practice and be overlooked. Let’s take canine parvovirus and canine other veterinary guidelines, your team already does influenza as examples. In addition to patient suffering everything from vaccination to hospitalization, including and the emotional stress placed on families, clients isolation of infected patients, systematic hand-washing, could face significant treatment costs if their pet picks use of personal protective equipment, and instrument up either of these viruses at the hospital: sterilization. Teams also provide education to families Average cost of parvovirus per canine: $1,467 with pets and infection surveillance to county, state, Most expensive case of canine parvovirus: $11,063 and federal disease control officials. Average cost of influenza per canine: $534 Most expensive case of canine influenza: $5,1472 Keeping pets, families, veterinary professionals, and communities safe from pathogens requires a Careful evaluation of disinfectants and implementation comprehensive approach. Biosecurity in veterinary of proper cleaning practices can prevent these kinds medicine is part of the One Health concept—it of infections and the added costs associated with approaches human, animal, and ecosystem health as treating them. related, not separate, issues for the future of everyone and everything on the planet. A Brief History of Disinfectants However, there is one element of infection prevention and control that can be overlooked in the hubbub of Disinfection inside an active veterinary practice might a typical day at a veterinary facility: strict and effective seem like the lowest-tech part of a high-tech job, but cleaning and disinfection. disinfectant technologies continue to become more advanced. If thinking of disinfection only brings to It’s easy to think a practice’s cleaning protocols are mind chlorine bleach, you might be surprised at how good enough if you’re not seeing the spread of disinfectants have changed over the past 100 years. infectious diseases or hospital-associated infections (HAIs). But just one patient catching an infection while Each kind of disinfectant—single active ingredient or at your facility often ends up costing more than using combined chemicals—carries its own advantages and a state-of-the-art disinfectant and proper protocols for disadvantages. Chlorine bleach, which was used back prevention. One of the most documented instances of in the 1920s, offered broad germicidal efficacy, but was an animal hospital incurring significant financial costs also unstable, a poor cleaner, and came with health due to the outbreak of an infectious disease is that of a hazards for staff and patients. large animal veterinary teaching hospital. Direct costs ©istock.com/Deejpilot  Infection Control and Biosecurity in Veterinary Medicine 3 DISINFECTANTS BY DECADE: PLUSES & MINUSES Chlorine 1920s (+) broad efficacy (–) unstable, poor cleaner, health hazards Alcohol 1940s (+) safe (–) slow acting, poor cleaner Phenolics Biguanides 1950s (+) kills TB (+) broad efficacy (–) health hazards (–) human and environmental health hazards Aldehydes 1960s (+) broad efficacy (–) health hazards, environmental issues Hydrogen Peroxide Organic Acids QUATs 1970s (+) safe, sustainable (+) safe, sustainable (+) broad efficacy, safe (–) unstable (–) limited efficacy (–) slow acting Peracetic Acid 1990s (+) fast acting (–) health hazards Accelerated Hydrogen Peroxide 2000s (+) broad efficacy, fast acting, safe, sustainable (+) indicates the pros of using this type of disinfectant, (–) indicates the cons of using this type of disinfectant 4 Infection Control and Biosecurity in Veterinary Medicine So-called quats (quaternary ammonium compounds), In the early 2000s, accelerated hydrogen peroxide which were first introduced in the 1970s and are still (AHP) came onto the market—first in Canada, then in widely used today, work great on influenza, Salmonella, the United States. Human hospitals, concerned with Staphylococcus, and fungi, but don’t work as well on costly hospital-associated infections, and the cruise heartier nonenveloped viruses like canine parvovirus. industry, whose customers can have an expensive Quats also require longer disinfection contact times vacation ruined by highly transmissible pathogens (the length of time the surface needs to remain wet to such as norovirus, were the first to use AHP for its be disinfected). Furthermore, the active agent in quats short contact time, effectiveness, and safety profile. is known to bind to cotton cloths, which causes the AHP carries a Category IV rating, which designates the disinfectant chemical to stay on the cloth rather than lowest toxicity rating given by the U.S. Environmental transfer onto the surface being wiped. Protection Agency (EPA). In addition, research has shown that some disinfectant “Accelerated” in accelerated hydrogen peroxide simply chemistries can leave behind a sublethal concentration means that it has been enhanced with safe, commonly- of the active ingredient after evaporation. This has the used, synergistic ingredients that allow AHP to kill potential to lead to antibiotic resistant, and potentially pathogens much faster and clean much better than chemical-resistant, organisms. We haven’t seen regular hydrogen peroxide. It typically takes 75 minutes chemical-resistant strains in the real world the same way of wet contact time to kill poliovirus with 3% hydrogen we see antibiotic resistance, however, the potential for peroxide found in most homes. AHP cuts that contact chemical resistance has been noted in research settings. time down to one minute for ready-to-use formulations or five minutes when mixed from concentrate in a Jumping to the 1990s, when contact time became more healthcare facility. of a concern, we saw the introduction of disinfectants using peracetic acid, which is much faster acting, but we find cases of healthcare workers developing occupational asthma and even chemical pneumonia. Increasing consumer Chemical safety is an important issue as work-related asthma accounts for approximately 16% of the total awareness and changing reported asthma cases in the United States.3 expectations about Some products, like triclosan (from the phenolics category disinfectants drives of disinfectants), have already been banned from consumer cleaning products because of links to cancer innovation in the chemical and endocrine disruption in people. Despite its dangers, technology space. triclosan is still used in commercial cleaning products. Increasing consumer awareness and changing expectations about disinfectants drives innovation in the chemical technology space. People, including veterinary AHP users in animal health, including food producers practice staff members, want products that work well and animal shelters, as well as large- and small-animal but don’t put anyone at risk. For example, a children’s veterinary hospitals, are now seeing considerable hospital in Toronto learned its cleaning staff members success in infection prevention. While AHP requires were avoiding the use of a new disinfectant selected gloves and eye goggles when handling the by the hospital leadership, fearing it was dangerous concentrate, no personal protective equipment is to the young patients.4 In fact, the new product had needed for the diluted solution, the premoistened been chosen specifically for both its efficacy and safety disinfecting wipes, or the ready-to-use solution. around kids. Once hospital leadership communicated the safety and efficacy of the disinfectant, compliance Concentrates are typically a more cost-effective among hospital staff rose dramatically. solution. However, they carry some risks, such as ©istock.com/SIBAS_minich 6 Infection Control and Biosecurity in Veterinary Medicine People, including veterinary practice staff members, want products that work well but don’t put anyone at risk. inaccurate dilution, leading to expensive overuse that was able to prevent the transfer of bacteria to (too much concentrate), or over-dilution (too little other surfaces, which is an important component in concentrate) increasing the risk of an outbreak. That’s reducing the transmission of harmful pathogens and why, in some cases, a premoistened or premixed reducing HAIs. Furthermore, a study by Rutala et al. disinfectant is a better choice. For example, ready- illustrates AHP’s superiority in comparison to standard to-use AHP products have a one-minute kill time for hydrogen peroxide and quats, as it was able to most pathogens, including tough-to-kill viruses like produce a 6-log reduction (99.9999%) in 30 seconds parvovirus in dogs and norovirus in people. against MRSA, VRE, and Acinetobacter baumannii.7 The efficacy of AHP has been supported by more than 30 clinical studies, articles, and research abstracts. 7 Steps to Good Infection Control A recent study by Alfa et al. showed that daily use of AHP applied to patient care high-touch environmental surfaces with a minimum of 80% cleaning compliance led to a 20% reduction in HAIs, including MRSA, VRE You do not need to be an award-winning chemist or and Clostridium difficile, and significant cost savings microbiologist to be good at infection control in a to the facility.5 Another study by Maillard et al. veterinary setting. Yes, the chemical and its proper demonstrated how AHP was able to produce at least a use is critical, but think about infection control with the 7-log reduction (99.99999%) against Staphylococcus big picture in mind. It’s a team effort based on several aureus and Acinetobacter baumannii.6 In addition, unique considerations for each veterinary practice. AHP was the only disinfectant used in the study Take into Choose the right Train your account mode disinfectant for entire staff on of transmission for your practice’s proper use of possible pathogens needs. the specific and initiate steps to disinfectant you break the cycle choose. Make the Identify and of infection. disinfectant you designate levels of 4 choose readily biosecurity risk based on the different areas of your facility. 3 5 accessible along with any other required tools. 2 6 Clarify roles and Set up routine responsibilities within quality-control your veterinary practice team. 1 7 measures and compliance monitoring.  Infection Control and Biosecurity in Veterinary Medicine 7 STEP 1: Clarify roles and responsibilities lobby and restrooms. Develop a schedule for cleaning within your veterinary practice team. frequency. If this division of responsibilities does not occur, surfaces or devices will be overlooked. Everyone needs to understand the protocols and processes involved as well as which team members How you divide up these tasks depends greatly on will complete which parts of the infection control work. the size of your facility and your staff. Large practices Create a functional group responsible for cleaning the often include staff members whose only job is cleaning animal care environments and equipment. Determine and disinfection, whereas smaller ones must assign together who is responsible for cleaning each surface these tasks across various job descriptions. Here is one and piece of equipment in all patient rooms, treatment possible scenario. areas, surgical suites, and public areas, including the JOB TITLE CLEANING / DISINFECTION RESPONSIBILITIES Receptionist / front office staff Lobby and other public areas Veterinary assistant or kennel assistant Hospitalization and boarding areas Veterinary technician Exam rooms, treatment area, surgical suite, diagnostic equipment Office or practice manager Offices and administrative areas Groomer Grooming and bathing areas Veterinarians Personal equipment, such as stethoscope Exam SAMPLE VETERINARY OFFICE FLOOR PLAN #1 Waiting Waiting Central Storage Alcove Alcove Laundry Surgery Exam Lockers #2 Canine Boarding Exam #3 ICU Canine Boarding Lobby/Reception Treatment Files/ Admin Exam #4 Ward Imaging Grooming Feline Boarding Exam Restroom #5 8 Infection Control and Biosecurity in Veterinary Medicine STEP 2: Identify and designate levels of This means the cleaning and disinfection process biosecurity risk based on the different areas of must be more stringent before another patient gets your facility. placed inside. Different areas of a veterinary facility pose different Also, consider the movement of equipment and levels of biosecurity risk. You could use numbering personnel between different biosecurity level areas. or color codes to designate these areas of risk. Often You would not want items from a red area regularly colors can be more quickly and easily understood being taken into green areas. by everyone involved with the care of animals within the hospital, including those responsible for cleaning Communication about each patient’s status needs to be and disinfection. For example, a kennel with a red tag flexible as well. As a pet’s condition changes, so might hanging on the door tells the person cleaning that an the infection control strategies required to maintain animal with an infectious disease stayed in the kennel. biosecurity in the veterinary practice. Small-Animal Hospital Biosecurity Level Level 1 Level 2 Level 3 Outpatient exam room Emergency admission rooms Sick patient’s exam room Surgery suites Dental procedures Patient’s ward Isolation ward Intensive care unit Oncology area ©istock.com/vm  Infection Control and Biosecurity in Veterinary Medicine 9 STEP 3: Take into account the mode of STEP 4: Choose the right disinfectant for transmission for possible pathogens and initiate your practice’s needs. steps to break the cycle of infection. Your team will need to determine your disinfectant needs: Many decisions the team needs to make will be based on Will you use one product for cleaning and another the mode of transmission of various possible pathogens. product for disinfecting? There are different products and processes, and some disinfectants Once an infectious pathogen enters a veterinary only work after the surface is already visibly clean, facility, it’s up to the veterinary team to break the while others will disinfect in the presence of organic infectious cycle through cleaning and disinfection. matter. Cleaners are not necessarily disinfectants Next steps include the following: and disinfectants are not necessarily cleaners. Removing fecal matter and other body fluids or However, one-step cleaner-disinfectants do exist. biofilms Will you use one disinfectant for daily use, then switch Cleaning all surfaces before disinfecting to another in cases of serious infectious issues? Or Disinfecting surfaces with properly concentrated will you use something that’s more protective all disinfectant the time? For example, practices that see a lot of emergencies likely need a disinfectant with a broader A mistake in diluting the disinfectant or not following spectrum of kill than a more wellness-focused required contact times can lead to the pathogenic practice that primarily does check-ups, vaccinations, organism spreading rather than being contained and and routine surgeries. Some products offer multiple eliminated. Once you’ve removed visible soiling, start dilutions to meet the needs of different facilities. cleaning and disinfecting at the cleanest area working What form of the chosen disinfectant will you use toward the dirtiest area of the item or space. This lessens (ready-to-use solution, concentrate you will dilute, the risk of contaminating surfaces as you work. ready-to-use disinfectant wipes)? The major sources of environmental contamination Your answers to these questions will depend on the are the patient’s endogenous flora and the hands of kinds of surfaces you need to disinfect as well as healthcare workers.9, 10 the possible pathogens you come across in your TRANSMISSION PRECAUTIONS FOR DOGS AND CATS8 Precautions Pathogen Transmission Precautions Mycobacterium tuberculosis Isolation, ideally negative pressure room Airborne Yersinia pestis Wear N95 respirator mask Francisella tularensis Barrier nursing Canine Infectious Respiratory Disease Complex Isolation Droplet Space animals four feet apart or more Infectious feline upper respiratory Barrier nursing tract disease Warning signage on the cage Multi-drug resistant bacteria Barrier nursing Dermatophytes Dedicated equipment Contact Leptospira spp Isolation for certain pathogens (see table at left) Salmonella spp Limit movement of affected animals Parvovirus Hand hygiene precautions Proper cleaning, disinfection and disposal 10 Infection Control and Biosecurity in Veterinary Medicine patient population. Some are much harder to kill with Most Micro-organism disinfectants than others. Difficult Bacterial spores STEP 5: Train your entire staff on proper use of the specific disinfectant you choose. Mycobacteria You can get everything you need to know, including Small nonenveloped virus training materials and even onsite workshops or lunch- and-learns, from the disinfectant manufacturer or sales Fungal spores reps. Make sure everyone reads the OSHA-mandated Safety Data Sheets (SDS) as well. Typically, you’ll find Gram negative bacteria the information you need about a product’s safety profile, hazards, and toxicology data in Section 2 and Large nonenveloped virus Section 11 of the SDS. Gram positive bacteria Pay attention to dilution calculations and required contact times so that whatever disinfectant you use works to the best of its ability. Enveloped virus Least Difficult Mycoplasmas STEP 6: Make the disinfectant you choose readily accessible along with any other required tools (such as measuring devices, bottles, buckets, clean cloths, and so on). Even staff members with the best training and intentions will do things their own way if you don’t make following the cleaning and disinfecting protocols as convenient as possible. Depending on the size of your veterinary facility, this means setting up several stations to keep cleaning and disinfection supplies handy. Moving around the facility less during cleaning lowers the chance of accidentally contaminating other areas. STEP 7: Set up routine quality-control measures and compliance monitoring. Examples include marking expiration dates on disinfectant concentrates and diluted product and maintaining cleaning logs where staff make notes about what they’ve cleaned and when (date/time). When you spot-check staff’s adherence to protocols, use your results to provide positive feedback when a job is done well. Perhaps more importantly, take the opportunity to coach and improve cleaning practices if you find issues. ©istock.com/diego_cervo  Infection Control and Biosecurity in Veterinary Medicine 11 Identifying the Ideal Disinfectant: Characteristics and 6 Questions to Ask While no disinfectant is perfect, The Centers for 2. Does it exhibit germicidal efficacy against a broad Disease Control and Prevention (CDC) lists the spectrum of microorganisms and possible pathogens? following properties as ideal characteristics. 3. How realistic is the product’s required contact time to reach efficacy? 4. Is it nontoxic, with low irritancy and allergenic PROPERTIES OF AN IDEAL DISINFECTANT, properties? Or will a fume hood or other ventilation ACCORDING TO THE CDC11 protections be needed to use safely? What is its safety profile for veterinary caregivers and patients? Broad spectrum 5. How does it affect the environment upon disposal? 6. Is it compatible with a wide variety of materials, without causing damage or deterioration of metals, Fast acting rubbers, plastics, or other materials? Not affected by environmental factors What Clean Smells Like Are you surprised this list of disinfectant criteria does not include a pleasant smell? In actuality, what we Nontoxic associate with the smell of clean has nothing to do with how well the product works. What’s your scent of choice? Lemon? Pine? Floral? Straight-up bleach? Surface compatibility Many times, if a veterinary hospital or any kind of facility for pets (grooming shop, boarding facility, Odorless training center) does not smell clean, it simply means the location is not being cleaned right or frequently Soluble enough—not necessarily that the disinfectant product isn’t working well. Stable In some cases, relying on the smell of cleaners and disinfectants creates a false sense of security about how clean your veterinary facility really is. Just because Cleaner something looks clean or smells clean doesn’t mean it has been properly disinfected. Environmentally friendly Odor free and scent free veterinary hospitals can play an important role in practicing Fear FreeSM veterinary medicine. Strong smells, even those that we may find Economical pleasant, can overwhelm pets’ senses for as long as a couple of days. When their sensitive noses become Easy to use flooded with an unnecessary scent, it limits their ability to assess the environment, which raises their levels of fear, anxiety, and stress. It’s much better for veterinary With this knowledge in hand, veterinary practices can patients to have a neutral or comforting sensory make decisions based on a handful of criteria in the experience than an overwhelming wall of scent. search for the best disinfectant to use: 1. Does the disinfectant provide good cleaning In addition, avian and exotic pets can be adversely properties and remain active even when organic affected by an environment’s air quality, so be matter (fecal matter, blood, saliva, and so on) is particularly careful choosing cleaning products if you present? see these more sensitive and fragile patients. 12 Infection Control and Biosecurity in Veterinary Medicine 9 Common Disinfection Mistakes During training and any later staff coaching on infection control expectations and protocols, pay attention to these common mistakes: 1 2 Eyeballing disinfectant Failing to reach solution mixtures. designated contact Always follow label instructions for time. dilution and use of a disinfectant. In other words, the surface being Measure everything. The tendency is cleaned does not stay wet with the to go light on the disinfectant, either due to right level of diluted disinfectant for the full incorrect measurements or an attempt to save length of time required for efficacy. money by using less product. Both strategies can lead to a disinfectant solution that is too weak to work properly. 4 Not knowing the shelf- 3 life of the disinfectant Confusing sanitized being used. with disinfection. In addition to knowing the shelf-life To claim something is sanitized, of the concentrated disinfectant, it’s the product must have reduced the important to know how long the disinfectant, pathogen load by 99.9% (also called once diluted, will continue to work properly. The a 3-log reduction). Disinfecting basically doubles diluted shelf-life for some disinfectants may only that amount to a 6-log reduction, reducing the be 24 hours, or as much as 90 days, so be sure pathogen load to 99.9999%. See additional you’re not wasting product by mixing up too information about log reduction on page 17. much at once or using expired product. 5 6 Topping off diluted Mixing cleaning disinfectant bottles, chemicals. rather than starting In addition to the potential for dangerous interactions, there’s a each time with a chance that adding one chemical to cleaned bottle and another will cause the disinfectant to not work fresh batch. properly. For example, if you add a scented Making this mistake means you’ve just mixed product to your disinfectant simply because old disinfectant with new. This can lead to an you like the smell better, there’s a chance the overdiluted or inactivated mixture. In other chemical mixture won’t be as potent as it needs words, it won’t work as well. to be.  Infection Control and Biosecurity in Veterinary Medicine 13 7 8 Spraying a surface and Not giving or receiving then wiping it with a dry product-specific cloth. training to veterinary Contact times for disinfectants mean team members. how long the surface needs to stay Just because you learned how to wet with disinfecting solution for full efficacy. clean from a family member at home doesn’t If you wet a surface down via spray bottle and mean you know how to properly clean and immediately wipe the surface dry, it won’t be disinfect in a veterinary healthcare setting. effective. In addition, spray bottles increase the And, just because you know how to use one risk of a pathogen getting blasted onto another disinfectant does not mean you know how to surface. It’s better to spray the disinfectant use another one. Different disinfectants work in onto the cloth to wet it down, then use physical different ways with various dilution rates, contact friction to apply the product to the surface. times, and safety precautions. Disinfectant This helps pick up any soil or debris microbes manufacturers or sales reps can provide training you cannot see and provides a more even materials or lead staff training sessions. Just ask. distribution of the disinfectant solution onto the surface than random splatters from the spray bottle. When the disinfectant air dries you have a better chance of achieving the designated contact time. 9 Not getting buy-in from team members on a switch to a new product. Change can be hard for individuals and teams. If people do not like or do not understand a new disinfectant product, your infection control program can be at risk of failing. ©istock.com/BlackJack3D 14 Infection Control and Biosecurity in Veterinary Medicine In any medical setting, infection control strategies must be part of everyone’s job even if they don’t do the cleaning itself. ©istock.com/YakobchukOlena  Infection Control and Biosecurity in Veterinary Medicine 15 5 Disinfection Myths Not true. Cleaning uses detergents and surfactants to break up soils (visible or not) on surfaces, but disinfectants kill or inactivate Cleaning and microorganisms and pathogens in various ways, depending Myth 1 disinfecting are upon the disinfectant used. Some penetrate the outer layer of a the same thing. pathogen’s cells, which weakens it. Others sort of blow the cells apart, almost like a bomb. All disinfectants Not even close. In the United States and Canada, you’ll find Myth 2 are created more than 8,000 registered disinfectant products for sale, and equal. there are several variations between them. Among the six most common chemistries used for disinfection, especially in healthcare settings, you’ll find vast differences in All disinfectants concentrations, contact times, and personal protection needed Myth 3 can be used in for proper usage. In addition, many disinfectants require you to the same way. clean a surface first with a product containing detergents before you can use a disinfectant on the surface. In any medical setting, infection control strategies must be Cleaning and part of everyone’s job even if they don’t do the cleaning itself. Myth 4 disinfection is It’s an important part of maintaining a safe and functional not my job. veterinary facility. Historically, this was true. In the past 10–15 years, however, If a disinfectant companies have been working to bring safer and more Myth 5 kills most environmentally sustainable disinfectants to market. germs, it must be toxic. If you’re using an older type of disinfectant product, be sure to provide training on protocols for safe use. Safety Data Sheets (SDS) are your best resource on toxicities and risks. See Section 2 and Section 11 on the SDS for details. Some products do indeed contain chemicals that are known carcinogens, known respiratory irritants (causing occupational asthma or chemical pneumonia), known skin sensitizers, known to release volatile organic compounds (leading to poor air quality), or known to contain nonylphenol ethoxylates (hormone-mimicking agents that can act as endocrine disruptors in the body). ©istock.com/ 16 Infection Control and Biosecurity in Veterinary Medicine Small Steps, Big Reasons Done well over time, cleaning and disinfection protocols lead to a decrease in the environmental bioburden inside a veterinary facility. Effective cleaning and disinfection also create a space that is free of odor and pathogens, making it a better place for animal caregivers to do their work and for pets to get the care they need. While roles and responsibilities remain important to biosecurity, in the end, it’s less about who does the cleaning and disinfecting than it is about how everyone in a veterinary practice works together to maintain a clean and safe environment. Everyone should be thoughtful and deliberate in the use of cleaners and disinfectants and cognizant of the ways infectious pathogens can get accidentally transferred from surface to surface, room to room, and patient to patient. You’re already doing so many important things. Simply take a little extra time and energy to further formalize your disinfection efforts. ©istock.com/FatCamera Infection Control and Biosecurity in Veterinary Medicine 17 What Does Log Reduction Mean? Logs are a form of mathematical “shorthand” that scientists use when describing the numbers of microorganisms present as a way to distinguish when a surface is sanitized versus disinfected and to track the various levels required in different medical and other scenarios. The number of zeros after the “one” equals the log reduction. 100 = 10 to the power of 2 (102) = 2 log 1,000 = 10 to the power of 3 (103) = 3 log 10,000 = 10 to the power of 4 (104) = 4 log 100,000 = 10 to the power of 5 (105) = 5 log 1 million or 1,000,000 or “1 followed by 6 zeros” can be written as “6 log.” Log Reduction vs. % Kill Some test reports use “log reductions” to describe results. Some use “% kill” or “5-log reduction.” How do we compare the two? 1-Log reduction = 90% kill 2-Log reduction = 99% kill 3-Log reduction = 99.9% kill 4-Log reduction = 99.99% kill 5-Log reduction = 99.999% kill 6-Log reduction = 99.9999% kill 7-Log reduction = 99.99999% kill 8-Log reduction = 99.999999% kill 9-Log reduction = 99.9999999% kill 10-Log reduction = 99.99999999% kill As with logs, there is a trick to doing the conversion easily. The number of the log reduction is the same as the number of nines in the percentage reduction. Therefore, a 5-log reduction gives five nines in the percentage reduction = 99.999% reduction. 18 Infection Control and Biosecurity in Veterinary Medicine Glossary of Disinfection and Biosecurity Terms Alcohol-based hand rub: an Cleaning: the removal of visible Detergents: compounds that alcohol-containing preparation soil, organic, and inorganic possess a cleaning action and designed for application to the contamination from a device have hydrophilic and lipophilic hands for reducing the number or surface, using either the parts. Although products used for of viable microorganisms on the physical action of scrubbing with handwashing or in an antiseptic hands. In the United States, such a surfactant or detergent and handwash in a healthcare setting preparations usually contain water or an energy-based process represent various types of 60–95% ethanol or isopropanol. (e.g., ultrasonic cleaners) with detergents, the term “soap” is used These are waterless antiseptic appropriate chemical agents. to refer to such detergents in this agents that do not require the use publication. Detergents make no of exogenous water. After applying Contact time: period of antimicrobial claims on the label. such an agent, the hands are time during a sterilization or rubbed together until the agent disinfection process in which Disinfectant: a chemical agent has dried. items are exposed to the sterilant used on inanimate objects (e.g., or disinfectant at the parameters floors, walls, sinks) to destroy Antiseptic: a germicide that specified by the manufacturer virtually all recognized pathogenic is used on skin or living tissue (e.g., time, concentration, microorganisms, but not for the purpose of inhibiting temperature, pressure). necessarily all microbial forms (e.g., or destroying microorganisms. bacterial endospores). The EPA Examples include alcohols, Contaminated: state of groups disinfectants on whether chlorhexidine, chlorine, having been in contact with the product label claims “limited,” hexachlorophene, iodine, microorganisms. As used in “general,” or “hospital” disinfectant. chloroxylenol (PCMX), quaternary health care, it generally refers ammonium compounds, and to microorganisms capable of Disinfection: the destruction of triclosan. producing disease or infection. pathogenic and other kinds of microorganisms by physical or Bioburden: the microbiological Decontamination: a process chemical means. Disinfection is less load (i.e., number of viable or treatment that renders a lethal than sterilization, because organisms in or on the object medical device, instrument, or it destroys most recognized or surface) or organic material environmental surface safe to pathogenic microorganisms, on a surface or object prior to handle. According to OSHA: but not necessarily all microbial decontamination, or sterilization, “the use of physical or chemical forms, such as bacterial spores. also known as “bioload” or means to remove, inactivate, or Disinfection does not ensure the “microbial load.” destroy bloodborne pathogens margin of safety associated with on a surface or item to the sterilization processes. Chemical sterilant: chemicals point where they are no longer used for the purpose of destroying capable of transmitting infectious Fomite: inanimate object capable all forms of microbial life including particles and the surface or item is of carrying a pathogen from one bacterial spores. rendered safe for handling, use, or location to another when it gets disposal” [29 CFR 1910.1030]. ©istock.com/rclassenlayouts  Infection Control and Biosecurity in Veterinary Medicine 19 moved or used throughout a Hospital disinfectant: a germicide hazard are not considered to be veterinary practice: that is registered by the EPA personal protective equipment. Stethoscopes or other for use on inanimate objects in small diagnostic tools (e.g., hospitals, clinics, dental offices, Sterilant: a liquid chemical thermometers) or any other medical-related germicide that destroys all forms Brushes and shaving tools facility. Efficacy is demonstrated of microbiological life, including Food and water bowls against Salmonella choleraesuis, high numbers of resistant bacterial Litterboxes Staphylococcus aureus, and spores. Toys Pseudomonas aeruginosa. Scales Sterilization: the use of a physical Any technology you carry— Log reduction: a 10-fold (one or chemical procedure to destroy smart phones, tablets, laptops decimal) or 90% reduction in all microorganisms including large Clipboards numbers of live bacteria. numbers of resistant bacterial Shoes spores. Noncritical: the category of Germicide: an agent that destroys medical items or surfaces that Surfactants: surface-active agents microorganisms, especially carry the least risk of disease that reduce surface tension. pathogenic organisms. Other transmission. This category has They help cleaning by loosening, terms with the suffix “-cide” (e.g., been expanded to include not emulsifying, and holding soil in virucide, fungicide, bactericide, only noncritical medical devices suspension, which can then be tuberculocide, sporicide) indicate but also environmental surfaces. more readily rinsed away. an agent that destroys the Noncritical medical devices touch microorganism identified by the only unbroken (intact) skin (e.g., Surgical hand scrub: an antiseptic- prefix. Germicides may be used blood pressure cuff). Noncritical containing preparation that to inactivate microorganisms in environmental surfaces can be substantially reduces the number or on living tissue (antiseptic) further divided into clinical contact of microorganisms on intact skin; it or on environmental surfaces surfaces (e.g., light handle) and is broad spectrum, fast-acting, and (disinfectants). housekeeping surfaces (e.g., persistent. floors, countertops). Hand hygiene: a general term that Transmission-based precautions: applies to handwashing, antiseptic Personal protective equipment a set of practices that apply to handwash, antiseptic hand rub, (PPE): is specialized clothing or patients with documented or and surgical hand antisepsis. equipment worn by an employee suspected infection or colonization for protection against a hazard with highly transmissible or Hospital-associated infection (e.g., gloves, masks, protective epidemiologically important (HAI): any infection associated eyewear, gowns). General work pathogens for which precautions with a medical or surgical clothes (e.g., uniforms, pants, beyond the standard precautions intervention. shirts, or blouses) not intended to are needed to interrupt function as protection against a transmission in healthcare settings. 20 Infection Control and Biosecurity in Veterinary Medicine References 1. Schaer, Dallap B.L. et al. 2010. “Outbreak of salmonellosis caused by Salmonella enterica Serovar Newport MDR- AmpC in a large animal veterinary teaching hospital.” Journal of Internal Veterinary Medicine 24: 1138–1146. 2. Pet insurance claims data from Nationwide (formerly Veterinary Pet Insurance). 3. Pyrek, Kelly. 2012. “Occupational health: protecting workers against chemical exposures.” Infection Control Today. October 11. http://www.infectioncontroltoday.com/articles/2012/10/occupational-health-protecting-workers-against- chemical-exposures.aspx. 4. Matlow, Anne et al. 2012. “Attitudes and beliefs, not just knowledge, influence the effectiveness of environmental cleaning by environmental service workers.” American Journal of Infection Control 40: 260–262. 5. Alfa, Michelle et al. 2015. “Use of a daily disinfectant cleaner instead of a daily cleaner reduced hospital-acquired infection rates.” American Journal of Infection Control 43: 141–146. 6. Sattar, Syed et al. 2015. “Disinfectant wipes are appropriate to control microbial bioburden from surfaces: use of a new ASTM standard test protocol to demonstrate efficacy.” Journal of Hospital Infection 91: 319–325. 7. Rutala, William et al. 2012. “Efficacy of improved hydrogen peroxide against important healthcare-associated pathogens.” Infection Control and Hospital Epidemiology 33: 1159–1161. 8. Sykes, Jane, and J. Scott Weese. 2014. “Infection control programs for dogs and cats.” In Canine and Feline Infectious Diseases, edited by Jane Sykes, 105–118. St. Louis, MO: Elsevier. 9. Rutala, William, and David J. Weber. 2014. “Selection of the ideal disinfectant.” Infection Control and Hospital Epidemiology 35: 855–865. 10. Stull, Jason et al. 2016. “Risk reduction and management strategies to prevent transmission of infectious disease among dogs at dog shows, sporting events, and other canine group settings.” Journal of the American Veterinary Medical Association 249: 612–627. 11. Rutala, William, and David J. Weber et al. 2008. Guidelines for disinfection and sterilization in healthcare facilities. Department of Health and Human Services, United States Center for Disease Control and Prevention. ©istock.com/stephanie phillips 4 Infection Control and Biosecurity in Veterinary Medicine Virox Animal Health, a division of Virox Technologies Inc., is the global manufacturer of accelerated hydrogen peroxide–based disinfectants to serve infection prevention professionals in human and animal health. Virox Animal Health is dedicated to providing support to the companion and farm animal health community via a team of technical experts and staff veterinarians on all things related to disinfection for infection prevention and biosecurity. Virox Animal Health presents a deliberately different approach to biosecurity and infection prevention with a revolutionary chemical disinfection technology combined with in-use protocols to optimize effectiveness. As an industry leader in human healthcare since 1998, Virox is ISO 9001 and ISO 14001 certified and was the first chemical manufacturer to achieve LEED Silver Certification in environmental responsibility. The American Animal Hospital Association is an international organization of nearly 6,000 veterinary care teams comprising more than 48,000 veterinary professionals committed to excellence in companion animal care. Established in 1933, AAHA is recognized for its leadership in the profession, its high standards for pet health care, and, most important, its accreditation of companion animal practices. For more information about AAHA, visit aaha.org. Front photo: ©istock.com/PeopleImages Back photo: ©istock.com/deepblue4you