Introduction to Microorganisms and Pathogenicity
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Questions and Answers

Which disease is caused by a picorna virus?

  • Measles
  • Polio (correct)
  • Smallpox
  • Yellow fever
  • What is a common method of prevention for measles?

  • Antibiotics
  • Quarantine
  • Boiling water
  • Vaccination (correct)
  • Which clinical manifestation is associated with yellow fever?

  • Paralysis
  • Yellow eyes (correct)
  • Running nose
  • Skin rashes
  • What body system is primarily affected by AIDS?

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

    Which method is NOT effective for the prevention of common cold?

    <p>Vaccination (D)</p> Signup and view all the answers

    What is the causative agent of smallpox?

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

    Which prevention method is recommended for controlling the spread of yellow fever?

    <p>Avoiding mosquito bites (A)</p> Signup and view all the answers

    What symptom is NOT commonly associated with measles?

    <p>High fever with blister (D)</p> Signup and view all the answers

    What is one way microbes can improve their survival in a host?

    <p>By producing toxins that may harm the host (C)</p> Signup and view all the answers

    What term is used for diseases that are transmitted from animals to humans?

    <p>Zoonotic diseases (D)</p> Signup and view all the answers

    Which of the following is not a method by which microbes can invade a susceptible host?

    <p>Nutrient supplementation for the host (A)</p> Signup and view all the answers

    Which of the following reservoirs is not considered a natural environment for microbes?

    <p>Manufactured products (D)</p> Signup and view all the answers

    What is a consequence of reduced host immune response due to microbial activity?

    <p>Accommodation of opportunistic infections (C)</p> Signup and view all the answers

    Which of the following actions is directly associated with the pathogenicity of microbes?

    <p>Inducing tissue changes that may lead to cancers (D)</p> Signup and view all the answers

    Which of the following statements about microbial reservoirs is incorrect?

    <p>Microbes can only survive in one type of reservoir. (B)</p> Signup and view all the answers

    What is an example of a direct effect of microbial activity on host tissue?

    <p>Anemia resulting from malaria infection (B)</p> Signup and view all the answers

    What is the primary role of microbes in ecosystems?

    <p>Synthesize and degrade organic substances (C)</p> Signup and view all the answers

    What is the difference between pathogenicity and normal human flora?

    <p>Pathogenicity involves disease-causing microbes while flora does not (B)</p> Signup and view all the answers

    Which of the following is NOT a way microbes can invade a host?

    <p>By flying through the air to enter the body (D)</p> Signup and view all the answers

    What is a prominent barrier to microbial invasion in hosts?

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

    Which microbe is specifically noted for its strong adherence to the urinogenital tract?

    <p>Nisseria gonorrhea (C)</p> Signup and view all the answers

    What must microbes do to elicit a disease condition in a host?

    <p>Establish contact, multiply, and colonize the host (A)</p> Signup and view all the answers

    Where can normal human microflora commonly be found?

    <p>On skin and body fluids, and in tissues (D)</p> Signup and view all the answers

    Which statement about microbial diseases is correct?

    <p>Understanding microbial diseases can reduce their incidence (B)</p> Signup and view all the answers

    What is the primary mode of transmission for microbes via food and water?

    <p>Contaminated food and water (Oral-faecal route) (B)</p> Signup and view all the answers

    How do pathogens typically reach the respiratory tract of a host?

    <p>Inhalation of droplets from coughs or sneezes (C)</p> Signup and view all the answers

    What term describes pathogens that are transmitted through direct or indirect contact?

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

    What is the role of vectors in the transmission of pathogens?

    <p>They facilitate transmission while feeding on the host's blood. (B)</p> Signup and view all the answers

    Which of the following is a way pathogens can be transmitted via contaminated objects?

    <p>Sharing toiletries or clothing (A)</p> Signup and view all the answers

    What happens when a host coughs or sneezes regarding microbial transmission?

    <p>Microbes are expelled in droplets into the surrounding air. (B)</p> Signup and view all the answers

    What condition often enables pathogens to spread through contaminated food or water?

    <p>Inadequate sanitary procedures (A)</p> Signup and view all the answers

    Which of the following statements is true regarding the transmission of microbes?

    <p>Some pathogens can remain infective even after droplets have dried. (C)</p> Signup and view all the answers

    What is the primary method by which Trichophyton sp spreads?

    <p>By sharing clothing and personal effects (B)</p> Signup and view all the answers

    Which symptom is NOT associated with malaria caused by Plasmodium sp?

    <p>Scaly bald patches (D)</p> Signup and view all the answers

    What type of organism causes malaria?

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

    What is the best preventive measure to avoid Trichophyton sp infections?

    <p>Ensuring personal cleanliness (C)</p> Signup and view all the answers

    Which statement about the life cycle of Plasmodium sp is true?

    <p>It needs a female Anopheles mosquito to complete its life cycle. (A)</p> Signup and view all the answers

    What is a common symptom of Trichophyton sp infections?

    <p>Scaly bald patches (D)</p> Signup and view all the answers

    Why is the development of resistance to antimalarial drugs a concern?

    <p>It leads to more severe malaria cases. (A)</p> Signup and view all the answers

    Which of the following is a common method to treat Trichophyton sp infections?

    <p>Antiseptic devices (D)</p> Signup and view all the answers

    What is the primary symptom associated with leprosy?

    <p>Loss of sensation (D)</p> Signup and view all the answers

    Which bacterium is responsible for tuberculosis?

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

    What is a common cause of pneumonia?

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

    Which of the following is a recommended preventive measure for gonorrhea?

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

    What type of infection is associated with syphilis?

    <p>Contagion by sexual contact (A)</p> Signup and view all the answers

    What is a significant symptom of tetanus?

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

    Which bacterium causes gonorrhea?

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

    What is a typical precaution against tuberculosis?

    <p>Isolation of infected individuals (A)</p> Signup and view all the answers

    What condition is associated with high fever and constant coughing?

    <p>Pneumonia (D)</p> Signup and view all the answers

    How can tetanus infections primarily occur?

    <p>Improper treatment of wounds (A)</p> Signup and view all the answers

    Flashcards

    Microorganisms

    Organisms too small to be seen without a microscope, including bacteria, viruses, fungi, and protozoa.

    Pathogenicity

    The ability of a microbe to cause disease in a host.

    Normal Human Flora

    The normal microbes that live on the surface of our body, usually harmless or even beneficial.

    Reservoirs

    Regions where pathogens reside and can be transmitted from.

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    Host Invasion

    The process by which microbes enter and establish themselves within a host.

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    Skin Barrier

    The outer layer of skin that acts as a barrier against invading microbes.

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    Microbial Enzymes

    Chemical substances produced by microbes that help them break down barriers and invade a host.

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    Body Orifices

    Openings on the body like the mouth, nose, anus, and vagina that provide entry points for microbes.

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    Pathogens

    Microscopic organisms that can cause disease, such as bacteria, viruses, fungi, and protozoa.

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    Infection

    The process of being infected by a pathogen.

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    Virulence

    The ability of a microbe to survive and multiply within a host, often harming the host in the process.

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    Toxins

    Harmful substances produced by pathogens that can damage host cells and tissues.

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    Zoonotic diseases

    Diseases that can be transmitted from animals to humans.

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    Microbial Transmission

    The transfer of microorganisms from one host to another.

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    Oral-Fecal Route

    A method of microbial transmission where a contaminated substance, like food or water, is ingested.

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    Direct Contact Transmission

    A mode of transmission involving direct contact between an infected individual and a susceptible host, such as through kissing, sexual intercourse, or sharing personal items.

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    Respiratory Route

    A method of transmission where microorganisms are spread by respiratory droplets released through coughing, sneezing, or talking.

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    Indirect Contact Transmission

    A mode of transmission involving contact with contaminated objects such as toiletries, clothing, or surfaces.

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    Vector-Borne Transmission

    A method of transmission where microorganisms are transferred via the bite of an infected insect or other vector.

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    Portal of Entry

    The entry point for microorganisms into a host.

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    What is a virus?

    A type of virus that causes a range of diseases, including polio, measles, and rabies.

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    What is a zoonotic disease?

    A term used to describe a viral disease that can be passed from animals to humans.

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    What is Polio?

    A viral disease that can cause paralysis, mainly affecting young children.

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    What is Measles?

    A highly contagious viral disease that causes a characteristic rash.

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    What is Yellow Fever?

    A viral disease that can cause fever, headache, and yellowing of the skin and eyes.

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    What is Smallpox?

    A highly contagious viral disease that can cause a severe skin rash and death.

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    What is a common cold?

    A common viral infection that causes a runny nose, headache, and sneezing.

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    What is AIDS?

    A viral disease caused by the human immunodeficiency virus (HIV) that weakens the immune system, making the body susceptible to other infections.

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    Ringworm (Tinea corporis)

    A fungal infection that causes scaly, ring-shaped patches on the skin, often on the scalp, thighs, and armpits.

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    Athlete's Foot (Tinea pedis)

    A fungal infection that affects the feet, causing itchy, scaly, or blistered skin between the toes.

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    Hyphae

    Root-like structures that help fungi absorb nutrients from their environment.

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    Protozoan

    A single-celled organism that can cause disease in humans.

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    Plasmodium sp.

    A parasitic protozoan that causes malaria, a serious disease that affects red blood cells.

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    Malaria Vector

    The female Anopheles mosquito that transmits the Plasmodium parasite, causing malaria.

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    Malaria

    A disease caused by the Plasmodium parasite, transmitted by mosquitoes, characterized by fever, chills, and headache.

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    Sleeping Sickness (Trypanosomiasis)

    A disease caused by the Trypanosoma parasite, transmitted by the tsetse fly, characterized by fever, lethargy, and sleeping problems.

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    Tuberculosis (TB)

    A bacterial infection that causes fever, coughing, and irritation of the respiratory tract. It can be transmitted through droplets released by coughing or sneezing.

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    Tetanus

    An often fatal bacterial infection that causes lockjaw, muscle spasms, and difficulty breathing. It can be acquired through contaminated wounds.

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    Pneumonia

    A bacterial infection that causes inflammation of the lungs, leading to chest pain, high fever, and persistent coughing. It can be spread through respiratory droplets.

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    Leprosy

    This chronic bacterial infection can cause skin lesions, loss of sensation, and nerve damage. It can spread through prolonged close contact with an infected individual.

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    Gonorrhea

    A sexually transmitted bacterial infection that can cause inflammation and discharge in the reproductive organs, difficulty urinating, and sterility. It can be contracted through sexual contact.

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    Syphilis

    A sexually transmitted bacterial infection that can cause mental impairment, skin blisters, and organ damage. It can be spread through sexual contact.

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    Cholera

    A bacterial infection that causes diarrhea, dehydration, and often death, particularly in children. It is spread primarily through contaminated water and food.

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    Meningitis

    A bacterial infection that causes inflammation of the brain and spinal cord, leading to fever, stiff neck, and headache. It can be spread through contaminated food or water.

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    Streptococcal Infection (Strep Throat)

    A bacterial infection that causes sore throat, fever, and swollen lymph nodes. It is spread through respiratory droplets.

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    Salmonella Infection

    A bacterial infection that causes food poisoning, leading to vomiting, diarrhea, and abdominal cramps. It is often associated with contaminated food.

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    Study Notes

    Introduction

    • Microbe is a short form for microorganism
    • Microorganisms cannot be seen with the naked eye
    • They include bacteria, fungi, viruses, and protozoa
    • Microbes play important roles in nature
    • They are important in ecosystems
    • Humans use microbes for things like beer, yogurt, antibiotics, baking and soak away systems
    • Learning outcomes include identifying microbes, microbial reservoirs, how microbes invade hosts, differences between pathogenicity and normal flora, methods of transmission, and analyzing the etiology and prevention of diseases

    Learning Outcomes

    • Define and identify various groups of microorganisms
    • Identify microbial reservoirs
    • Explain how microbes invade a susceptible host
    • Differentiate between pathogenicity and normal flora
    • Establish routes of transmission
    • Analyze the etiology and prevention of microbial diseases

    Main Body

    Introduction

    • The module introduces microorganisms, host invasion, pathogenicity, reservoirs, transmission, and microbial diseases
    • It will be discussed under two units (Unit 1 and Unit 2)

    Unit 1: Microorganisms

    • Includes subunit 1 (host invasion)
    • Includes subunit 2 (pathogenicity),
    • Includes subunit 3 (reservoirs)

    Unit 2: Microorganisms

    • Includes subunit 2 (transmission)
    • Includes subunit 3 (microbial diseases)

    Host Invasion

    • Microbes play significant roles in nature, even though small.
    • They form a critical part of communities and ensure interactions between living and non-living components.
    • They are essential for ecosystem sustenance
    • Humans use their abilities to produce various products (e.g., beer, yogurt, antibiotics)
    • They can harm humans (e.g cause disease)
    • Disease occurs when microbes contact, multiply, and colonize a host (superficially or in tissues).
    • They face the host's defense mechanisms.
    • Skin is a crucial defense barrier that microbes try to overcome.
    • Wounds, mouths, anuses, and vaginas are entry points for microbes.
    • Microbes show preference areas.

    Pathogenicity

    • Microbes initiate alterations in the host due to their activities
    • Activities include food acquisition and avoiding host defense actions
    • They produce toxins
    • Confiscate nutrients
    • Destroy host tissue (e.g. in anaemia)
    • Cause cancers or tumors
    • Reduce host immune response

    Reservoirs

    • Microbes reside temporarily in environments called reservoirs.
    • Examples of reservoirs include water, soil, atmosphere, humans, and wild animals
    • Microbes move between reservoirs to survive.
    • Diseases caused by microbes transmitted from animal reservoirs to humans are called zoonotic diseases

    Transmission

    • Microbes move by various methods
    • Contaminated food or water (oral-faecal)
    • Respiratory tract
    • Direct contact with infected people or contaminated objects.
    • Inoculation (through the skin)

    Microbial Diseases

    • Various kinds of microbial diseases
    • Caused by bacteria, fungi, virus, and protozoa
    • The causes, location in the host, transmission, symptoms, diagnosis, and treatment are covered in more detail in later parts of the module.

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    Description

    Explore the fascinating world of microorganisms in this quiz. You'll learn to identify different types of microbes, their roles in ecosystems, and how they invade hosts. Additionally, the quiz will cover the distinctions between pathogenicity and normal flora, as well as methods of disease prevention.

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