Infection Control and Asepsis
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Questions and Answers

Which of the following factors least affects the respiratory tract's defense mechanisms against infection?

  • Smoking
  • Decreased humidity
  • High concentration of nitrogen (correct)
  • Cold air
  • The acidity of gastric secretions in the gastrointestinal tract hinders peristalsis in the small intestine.

    False (B)

    How does the urinary tract's flushing action prevent infection?

    It washes away microorganisms on the lining of the bladder and urethra.

    In the vagina, normal flora maintain a low ______, which inhibits the growth of many pathogenic microorganisms.

    <p>pH</p> Signup and view all the answers

    Match the defense mechanism with factors that may alter it:

    <p>Skin (Intact multilayered surface) = Cuts, abrasions, puncture wounds Mouth (Intact multilayered mucosa) = Lacerations, trauma, extracted teeth Urinary Tract (Flushing action of urine flow) = Urinary catheter placement, obstruction from growth or tumor Vagina (Normal flora causing low pH) = Antibiotics, excessive douching</p> Signup and view all the answers

    Which of the following best describes the primary distinction between medical and surgical asepsis?

    <p>Medical asepsis aims to reduce the number of microorganisms, while surgical asepsis eliminates all microorganisms. (D)</p> Signup and view all the answers

    The presence of nonpathogenic microorganisms on or in the body invariably leads to opportunistic infections, particularly in immunocompromised individuals.

    <p>False (B)</p> Signup and view all the answers

    In the context of infection prevention and control, what is the significance of identifying and understanding the 'chain of infection'?

    <p>Interrupting transmission</p> Signup and view all the answers

    A nurse explains to a patient that consistently practicing thorough hand hygiene is a critical measure to break the chain of infection at the _______ stage.

    <p>transmission</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Fomite = An inanimate object that carries infectious agents. Vector = A living organism that transmits disease. Reservoir = A place where microorganisms survive and multiply. Virulent = The degree of pathogenicity of a microorganism.</p> Signup and view all the answers

    Which scenario poses the greatest risk for Staphylococcus aureus transmission, considering its primary reservoir?

    <p>Changing a wound dressing without proper hand hygiene and sterile technique. (D)</p> Signup and view all the answers

    Infection with E. coli serotype O157:H7 invariably leads to hemolytic-uremic syndrome (HUS).

    <p>False (B)</p> Signup and view all the answers

    A patient presents with a persistent cough, night sweats, and bloody sputum. Based on the table and the signs, what is the most likely infectious agent?

    <p>Mycobacterium tuberculosis or Tubercle bacillus</p> Signup and view all the answers

    A patient is diagnosed with malaria after visiting a tropical region. The infectious agent responsible for this disease is transmitted by the ______.

    <p>mosquito</p> Signup and view all the answers

    Match the following organisms with the commonly associated infection/disease:

    <p>Varicella zoster virus = Shingles β-Hemolytic group A streptococci = Strep throat Candida albicans = Thrush Rickettsia rickettsii = Rocky Mountain spotted fever</p> Signup and view all the answers

    Which of the following scenarios poses the LEAST risk of transmitting HIV?

    <p>A nurse accidentally punctures their skin with a needle used on an HIV-positive patient, resulting in a very shallow wound with no visible blood. (D)</p> Signup and view all the answers

    Which patient condition necessitates the most rigorous sterile technique to prevent infection?

    <p>Performing a dressing change on a surgical incision. (A)</p> Signup and view all the answers

    Compromised skin integrity primarily affects a patient's susceptibility by disrupting the portal of entry in the chain of infection.

    <p>False (B)</p> Signup and view all the answers

    In the context of infection control, differentiate explicitly between medical asepsis and surgical asepsis, emphasizing their respective applications.

    <p>Medical asepsis aims to reduce the number and spread of microorganisms and is used in routine patient care. Surgical asepsis aims to eliminate <em>all</em> microorganisms and is used in sterile procedures.</p> Signup and view all the answers

    A patient undergoing chemotherapy is more vulnerable to infections primarily due to the treatment's impact on the ______.

    <p>Immune system</p> Signup and view all the answers

    Match each element of the infection chain with its implication for infection control:

    <p>Infectious Agent = Identifying the specific pathogen and its characteristics Reservoir = Implementing measures to control the environment where pathogens thrive Portal of Exit = Containing bodily fluids and secretions to prevent pathogen escape Mode of Transmission = Using aseptic techniques and barriers to prevent pathogen spread</p> Signup and view all the answers

    What is the most effective method for a nurse to interrupt the 'mode of transmission' link in the chain of infection?

    <p>Ensuring proper hand hygiene practices are consistently followed. (C)</p> Signup and view all the answers

    A patient with COPD might be more susceptible to infection due to impaired mucociliary clearance in the respiratory tract.

    <p>True (A)</p> Signup and view all the answers

    Describe how diabetes mellitus increases a patient's susceptibility to infection, focusing on its impact on the host's defense mechanisms.

    <p>Elevated glucose levels in diabetes can impair the function of immune cells (e.g., neutrophils) and reduce blood supply to tissues, making patients more susceptible to infections.</p> Signup and view all the answers

    What is a key characteristic that distinguishes viruses from bacteria, leading to the term 'filterable viruses'?

    <p>Viruses can pass through laboratory filters that trap bacteria. (C)</p> Signup and view all the answers

    Viruses, being complete cells with the ability to self-replicate independently, are susceptible to antibiotic treatments.

    <p>False (B)</p> Signup and view all the answers

    Describe the fundamental structural difference between viruses and cells, and explain how this difference affects viral reproduction.

    <p>Viruses are not complete cells but consist of RNA or DNA with a protein coat. They lack essential metabolic processes and rely on a host cell to reproduce.</p> Signup and view all the answers

    Viruses gain entry to the host through various routes, including respiratory pathways, breaks in ______, or via vectors such as mosquitoes.

    <p>skin</p> Signup and view all the answers

    Match the historical events with their impact on the understanding and management of viruses.

    <p>Discovery of 'filterable viruses' before 1900 = Showed that disease-causing agents smaller than bacteria exist. Development of the electron microscope in 1941 = Allowed for the detailed study of viral structure and function. COVID-19 Pandemic in 2020 = Resulted in significant changes in healthcare practices to prevent viral spread.</p> Signup and view all the answers

    During which stage of an infectious process is the host potentially infectious, even before specific symptoms manifest?

    <p>Incubation Period (B)</p> Signup and view all the answers

    Localized infections affecting only a specific area of the body generally pose a higher risk of fatality compared to systemic infections which affect the entire body.

    <p>False (B)</p> Signup and view all the answers

    An increase in what type of blood cells is indicative of leukocytosis, a sign of systemic inflammation?

    <p>white blood cells</p> Signup and view all the answers

    In the context of healthcare, infections acquired by patients during medical treatment are known as ______ infections.

    <p>health care-associated</p> Signup and view all the answers

    Match the stage of infection with its key characteristic:

    <p>Incubation Period = Time between pathogen entry and symptom onset Prodromal Stage = Nonspecific signs and microorganisms multiply Acute Stage = Specific infection signs and symptoms Convalescence = Disappearance of acute symptoms</p> Signup and view all the answers

    Which of the following is NOT a typical trigger for the inflammatory response?

    <p>Emotional distress (C)</p> Signup and view all the answers

    Administering antimicrobial agents is solely the responsibility of physicians; nurses only assist in monitoring the patient's response.

    <p>False (B)</p> Signup and view all the answers

    Besides administering medications, name one supportive therapy that nurses use to aid a patient's body in defending against infection.

    <p>nutrition</p> Signup and view all the answers

    Redness that occurs during the inflammatory response is also known as ______.

    <p>rubor</p> Signup and view all the answers

    Which organization monitors and sets standards for the prevention of health care-associated infections (HAIs)?

    <p>Centers for Disease Control and Prevention (CDC) (C)</p> Signup and view all the answers

    Which characteristic of bacterial spores contributes most significantly to the challenges in eliminating them from the environment?

    <p>Their high resistance to heat and disinfectants. (B)</p> Signup and view all the answers

    A bacterium is observed moving rapidly via a wiggling motion of its entire cell body. Based on this characteristic, to which of the following morphological groups does it MOST likely belong?

    <p>Spirilla (A)</p> Signup and view all the answers

    Gram-positive bacteria are easily identified because their cell walls dissolve completely when exposed to a solvent during the staining process.

    <p>False (B)</p> Signup and view all the answers

    What specialized structure do some bacteria form under unfavorable environmental conditions to ensure their survival?

    <p>spores</p> Signup and view all the answers

    The hair-like projections that enable some bacteria to move are called ______.

    <p>flagella</p> Signup and view all the answers

    What is the primary purpose of performing a bacterial sensitivity test?

    <p>To assess which antibiotics inhibit the bacteria's growth. (D)</p> Signup and view all the answers

    Anaerobic bacteria thrive in oxygen-rich environments.

    <p>False (B)</p> Signup and view all the answers

    Why does capsule formation in bacteria pose challenges in treatment?

    <p>Capsules contribute to multiple-drug resistance, making antibiotic therapy less effective. (A)</p> Signup and view all the answers

    What is the term used to describe bacteria that require oxygen to survive?

    <p>aerobic</p> Signup and view all the answers

    Match each bacterial characteristic with its corresponding description:

    <p>Aerobic = Requires oxygen to survive. Anaerobic = Does not require oxygen to survive. Flagella = Hair-like projections used for motility. Spores = Resistant structures formed under unfavorable conditions.</p> Signup and view all the answers

    Flashcards

    Medical Asepsis

    Techniques that reduce the number and spread of pathogens.

    Surgical Asepsis

    Techniques that eliminate all pathogens from an area.

    Chain of Infection

    A series of events that lead to the spread of infections.

    Standard Precautions

    Infection control practices applied to all patients.

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    Pathogens

    Microorganisms that cause disease.

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    Skin as Defense Mechanism

    Intact multilayered surface acting as the body's first line of defense against infection.

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    Sebum Function

    Sebum contains fatty acids that can kill some bacteria, aiding in infection prevention.

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    Saliva's Role

    Saliva provides a barrier to microbes, washes away particles, and contains microbial inhibitors like lysozyme.

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    Respiratory Tract Defense

    Cilia in the respiratory tract trap and sweep out inhaled microbes, preventing them from reaching the lungs.

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    Susceptibility to Infection

    Factors that increase the likelihood of infection in patients.

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    Healthcare Facility Risk

    Infection risk is higher for patients in healthcare due to weakened immunity.

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    Asepsis

    Absence of pathogenic microorganisms to prevent infection.

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    Infectious Agent

    A pathogen responsible for causing infection.

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    Portal of Exit

    The pathway through which pathogens leave their host.

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    Mode of Transmission

    How an infectious agent is spread from one host to another.

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    Staphylococcus aureus

    A bacterium commonly found on skin and hair that can cause wound infections, pneumonia, and food poisoning.

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    β-Hemolytic group A streptococci

    Bacteria found in the throat and skin, linked to strep throat, rheumatic fever, and scarlet fever.

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    Escherichia coli

    Bacteria primarily found in the colon, known for causing enteritis.

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    Neisseria gonorrhoeae

    Bacterium that infects the genitourinary tract, causing gonorrhea and pelvic inflammatory disease.

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    Varicella zoster virus

    Virus responsible for chickenpox and shingles, spread through respiratory droplets and vesicle fluid.

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    Malaria

    A disease caused by Plasmodium falciparum, transmitted through mosquito bites, leading to fever and chills.

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    Incubation Period

    Time between pathogen entry and symptom appearance.

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    Prodromal Stage

    Nonspecific symptoms appear; disease becomes more contagious.

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    Acute Stage

    Specific symptoms of infection manifest; often very contagious.

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    Convalescence

    Period of recovery after acute symptoms disappear.

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    Localized Infection

    Infection confined to a specific area of the body.

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    Systemic Infection

    Infection that affects the whole body and can be more serious.

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    Inflammatory Response

    Body's reaction to injury or infection, including swelling and redness.

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    Common Signs of Inflammation

    Includes redness, swelling, heat, and pain.

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    Health Care-Associated Infections (HAIs)

    Infections acquired during healthcare treatments.

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    Triggers of Inflammatory Response

    Agents like trauma, chemicals, or microorganisms that cause inflammation.

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    Bacterial Shapes

    Bacteria come in three basic shapes: round, oblong, and spiral.

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    Aerobic vs Anaerobic Bacteria

    Aerobic bacteria need oxygen, while anaerobic bacteria do not.

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    Flagella

    Flagella are hair-like projections that provide motility to bacteria.

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    Spore Formation

    Some bacteria form spores when conditions are unfavorable, exhibiting high resistance.

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    Capsule Formation

    Capsules protect bacteria in hostile conditions and are linked to drug resistance.

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    Gram-Positive vs Gram-Negative

    Bacteria are classified based on staining techniques determining their cell wall structure.

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    Sensitivity Test

    A test to determine which antibiotics inhibit bacterial growth.

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    Motility

    The ability of some bacteria to move using flagella in a wavelike motion.

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    Cell Division

    Bacteria can form pairs or chains during division.

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    Laboratory Identification

    Trained personnel use staining to examine and identify bacterial characteristics.

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    Viruses

    Smallest disease-causing agents composed of RNA or DNA and protein coat.

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    Viral Entry

    How viruses enter the body: respiratory, gastrointestinal, or through skin.

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    Viral Replication

    Process by which viruses reproduce using the host cell's materials.

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    Antibiotics and Viruses

    Antibiotics are ineffective against viruses; they target bacteria.

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    COVID-19 Management

    Involves mask wearing, distancing, and handwashing to prevent spread.

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    Study Notes

    Objectives

    • Explain the difference between medical and surgical asepsis.
    • Explain how each element of the chain of infection contributes to infection.
    • List five major classifications of pathogens.
    • Identify the body's normal defenses against infections.
    • Discuss nursing interventions used to interrupt the chain of infection.
    • Describe the signs and symptoms of a localized infection and those of a systemic infection.

    Key Terms

    • asepsis
    • antiseptic
    • carrier
    • CDC
    • contamination
    • disinfection
    • endogenous
    • exogenous
    • fomite
    • health-care-associated infection
    • host
    • infection prevention and control
    • medical asepsis
    • microorganism
    • reservoir
    • spore
    • standard precautions
    • sterilization
    • surgical asepsis
    • vector
    • virulent

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    Description

    This quiz covers the body's defense mechanisms against infection, including the respiratory, gastrointestinal, and urinary tracts, and the vagina. It also addresses asepsis, the chain of infection, and the importance of hand hygiene in preventing the spread of pathogens.

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