The Chain Of Infection Quiz

Reviewed by Farah Naz
Farah Naz, MBBS, Medicine |
Medical Expert
Review Board Member
Farah holds a Bachelor of Medicine and Bachelor of Surgery (MBBS) from Dow University of Health Sciences. She gained valuable experience through internships in Radiology, Cardiology, and Neurosurgery, and has contributed to two research publications in medical journals. Passionate about healthcare education, Farah excels in crafting medical content, including articles, literature reviews, and e-learning courses. Leveraging her expertise, she meticulously reviews medical science quizzes, ensuring accuracy and educational value for aspiring healthcare professionals.
, MBBS, Medicine
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The Chain Of Infection Quiz - Quiz


Check your knowledge of the chain of infection and its breaking with the below quiz. Also, the test will review your understanding of infection transmission, infection control, and infection prevention in the healthcare setting. The chain of infection consists of an infectious agent, a reservoir, the portal of exit, a mode of transmission, the portal of entry, and a susceptible host. How well do you know about infection prevention? Take this quiz and evaluate for yourself. Good luck!


Questions and Answers
  • 1. 

    The Chain of Infection is a model of:

    • A.

      How bacteria multiply

    • B.

      How microorganisms mutate to become pathogens

    • C.

      How an infection affects the immune system

    • D.

      How infections can be prevented

    • E.

      How pathogenic microorganisms are transmitted from one person to another

    Correct Answer
    E. How pathogenic microorganisms are transmitted from one person to another
    Explanation
    The Chain of Infection is a model that explains how pathogenic microorganisms are transmitted from one person to another. It outlines the different links in the chain, including the infectious agent (the microorganism), the reservoir (where the microorganism lives and multiplies), the portal of exit (how the microorganism leaves the reservoir), the mode of transmission (how the microorganism is transferred to another person), the portal of entry (how the microorganism enters the new host), and the susceptible host (the person who is at risk of becoming infected). Understanding this model helps identify and interrupt the different steps in the chain to prevent the spread of infections.

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  • 2. 

    There are 6 links in the Chain of Infection. These include each of the following except:

    • A.

      Susceptible host

    • B.

      Portal of entry

    • C.

      Mode of transmission

    • D.

      Personal protective device

    • E.

      Reservoir

    Correct Answer
    D. Personal protective device
    Explanation
    The Chain of Infection refers to the series of events that must occur in order for an infection to spread. Each link in the chain represents a necessary component for the transmission of the infection. The links include reservoir (where the infectious agent resides), portal of exit (how the agent leaves the reservoir), mode of transmission (how the agent is transferred to a new host), portal of entry (how the agent enters a new host), susceptible host (a person who is at risk of becoming infected), and personal protective device is not a link in the Chain of Infection.

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  • 3. 

    In any healthcare setting, the Chain of Infection can be interrupted most readily at this step:

    • A.

      Portal of exit

    • B.

      Portal of entry

    • C.

      Mode of transmission

    • D.

      Causative agent

    • E.

      Susceptible host

    Correct Answer
    C. Mode of transmission
    Explanation
    The mode of transmission is the step in the Chain of Infection where the pathogen is transferred from the source to a susceptible host. Interrupting the mode of transmission can be achieved through various measures such as hand hygiene, wearing personal protective equipment, practicing respiratory etiquette, and implementing proper sterilization and disinfection techniques. By preventing the pathogen from being transmitted, the spread of infection can be stopped or minimized, making it the step where the Chain of Infection can be most readily interrupted.

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  • 4. 

    Universal Precautions are:

    • A.

      To be applied only for patients at high risk of infection

    • B.

      May be ignored without concern that a healthcare worker or the patient may develop an infection

    • C.

      The name of current CDC recommendations for infection control and prevention

    • D.

      Mandatory regulations enforced by OSHA in all health care settings as part of its Blood borne Pathogens Standard

    • E.

      Are required by HIPAA

    Correct Answer
    D. Mandatory regulations enforced by OSHA in all health care settings as part of its Blood borne Pathogens Standard
    Explanation
    Universal Precautions are mandatory regulations enforced by OSHA in all healthcare settings as part of its Bloodborne Pathogens Standard. These precautions are put in place to protect healthcare workers and patients from the risk of infection. They involve treating all blood and certain body fluids as if they are infectious, regardless of the perceived risk. Universal Precautions require the use of personal protective equipment, such as gloves and masks, proper handling and disposal of sharps, and adherence to strict hygiene practices. These precautions are essential in preventing the transmission of bloodborne pathogens and ensuring a safe healthcare environment.

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  • 5. 

    Each of the following is true about Standard Precautions except:

    • A.

      Healthcare personnel caring for patients wear a gown and gloves for all interactions that may involve contact with the patient or potentially contaminated areas in the patient's environment.

    • B.

      Standard Precautions involve hand hygiene; use of gloves, gown, mask, eye protection, or face shield, depending on the anticipated exposure; and safe injection practices.

    • C.

      Implementation of Standard Precautions constitutes the primary strategy for the prevention of healthcare-associated transmission of infectious agents among patients and healthcare personnel.

    • D.

      Standard Precautions are intended to protect patients by ensuring that healthcare personnel do not carry infectious agents to patients on their hands or via equipment used during patient care.

    • E.

      Standard Precautions include a group of infection prevention practices that apply to all patients, regardless of suspected or confirmed infection status, in any setting in which healthcare is delivered.

    Correct Answer
    A. Healthcare personnel caring for patients wear a gown and gloves for all interactions that may involve contact with the patient or potentially contaminated areas in the patient's environment.
    Explanation
    The given statement is true about Standard Precautions. Standard Precautions require healthcare personnel to wear a gown and gloves for all interactions that may involve contact with the patient or potentially contaminated areas in the patient's environment. This is done to prevent the transmission of infectious agents from healthcare personnel to patients. Standard Precautions also include other practices such as hand hygiene, use of personal protective equipment, and safe injection practices. These precautions are implemented in all healthcare settings to protect both patients and healthcare personnel from the spread of infectious diseases.

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  • 6. 

    There are 3 recently added elements to Standard Precautions that focus on the protection of patients. These are 1) Respiratory Hygiene/Cough Etiquette, 2) Safe Injection Practices, and 3) Use of Masks for Insertion of Catheters. Respiratory Hygiene/Cough Etiquette includes all of the following except:

    • A.

      Education of healthcare facility staff, patients, and visitors

    • B.

      Posted signs, in language(s) appropriate to the population served, with instructions to patients and accompanying family members or friends

    • C.

      Covering the mouth/nose with a tissue when coughing and prompt disposal of used tissues, using surgical masks on the coughing person when tolerated an appropriate

    • D.

      Spatial separation, ideally >3 feet, of persons with respiratory infections in common waiting areas

    • E.

      Healthcare workers wear a gown and gloves for all interactions that may involve contact with the patient

    Correct Answer
    E. Healthcare workers wear a gown and gloves for all interactions that may involve contact with the patient
    Explanation
    The correct option is "healthcare workers wear a gown and gloves for all interactions that may involve contact with the patient." Because, wearing a gown and gloves for all interactions that may involve contact with the patient is not part of Respiratory Hygiene/Cough Etiquette. The other options listed in the question are all components of Respiratory Hygiene/Cough Etiquette, such as education of healthcare facility staff, patients, and visitors, posted signs with instructions, covering the mouth/nose with a tissue, and spatial separation of persons with respiratory infections.

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  • 7. 

    Safe Injection Practices require adherence to basic principles of aseptic technique for the preparation and administration of parenteral medications. Each of the following statements is true except for: 

    • A.

      Use of single-dose vials is preferred over multiple-dose vials, especially when medications will be administered to multiple patients.

    • B.

      Outbreaks related to unsafe injection practices indicate that some healthcare personnel are unaware of, do not understand, or do not adhere to basic principles of infection control and aseptic technique.

    • C.

      Among the deficiencies identified in recent outbreaks were a lack of oversight of personnel and failure to follow-up on reported breaches in infection control practices in ambulatory settings. equipment and medication

    • D.

      Infection control and aseptic technique need to be reinforced in training programs and incorporated into institutional polices that are monitored for adherence.

    • E.

      Reinsertion of used needles into a multiple-dose vial or solution container is acceptable as long as the needle is disinfected after each administration.

    Correct Answer
    E. Reinsertion of used needles into a multiple-dose vial or solution container is acceptable as long as the needle is disinfected after each administration.
    Explanation
    The correct answer is "Reinsertion of used needles into a multiple-dose vial or solution container is acceptable as long as the needle is disinfected after each administration." This statement is false because reinserting used needles into a multiple-dose vial or solution container is not an acceptable practice. It can lead to contamination and increase the risk of infection. Safe injection practices require the use of new needles and syringes for each administration to ensure patient safety and prevent the spread of infections.

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  • 8. 

    Transmission Based Precautions are a second level of precautions used when the route(s) of transmission is (are) not completely interrupted using Standard Precautions alone. Each of the statements below is true except:

    • A.

      Contact Precautions also apply where the presence of excessive wound drainage, fecal incontinence, or other discharges from the body suggest an increased potential for extensive environmental contamination and risk of transmission.

    • B.

      Healthcare personnel caring for patients on Contact Precautions wear a gown, gloves, and mask for all interactions that may involve contact with the patient or potentially contaminated areas in the patient's environment.

    • C.

      Droplet Precautions are intended to prevent transmission of pathogens spread through close respiratory or mucous membrane contact with respiratory secretions.

    • D.

      In settings where Airborne Precautions cannot be implemented due to limited engineering resources (e.g., physician offices), masking the patient, placing the patient in a private room (e.g., office examination room) with the door closed, and providing intravenous antibiotics will reduce the likelihood of airborne transmission until the patient is no longer in the facility.

    • E.

      Healthcare personnel caring for patients on Airborne Precautions wear a mask that is donned prior to room entry.

    Correct Answer
    D. In settings where Airborne Precautions cannot be implemented due to limited engineering resources (e.g., physician offices), masking the patient, placing the patient in a private room (e.g., office examination room) with the door closed, and providing intravenous antibiotics will reduce the likelihood of airborne transmission until the patient is no longer in the facility.
    Explanation
    Antibiotic use is not included in Transmission Based Precautions.

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  • 9. 

    A culture of targeting zero healthcare associated infections and zero tolerance for unsafe practices is characterized by each of the following except:

    • A.

      An expectation that infection prevention and control measures will be applied consistently by all healthcare workers, 100% of the time

    • B.

      Performing annual reviews of surgical site infections to determine the post common type of pathogen accountable for infection prevention

    • C.

      Transparency and continuous learning where mistakes and/or poor systems and processes can be openly discussed without fear of penalty

    • D.

      Prompt investigation of healthcare associated infections of greatest concern to the organization and/or community

    • E.

      A safe environment for healthcare workers to pursue 100% adherence, where they are empowered to hold each other

    Correct Answer
    B. Performing annual reviews of surgical site infections to determine the post common type of pathogen accountable for infection prevention
    Explanation
    Real time data, not annual reviews, are needed for driving improvements to achieve the goal of 0% healthcare associated infections.

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  • 10. 

    The area where the causative agent can live is called what?

    • A.

      Mode of transmission

    • B.

      Reservoir

    • C.

      Portal of exit

    • D.

      Portal of entry

    Correct Answer
    B. Reservoir
    Explanation
    The area where the causative agent can live is called a reservoir. A reservoir is a source or habitat in which the causative agent can survive, multiply, and potentially infect a susceptible host. Reservoirs can be living organisms, such as humans, animals, or insects, or they can be non-living, such as soil, water, or contaminated surfaces. Identifying and controlling reservoirs is important in preventing the spread of infectious diseases.

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Farah Naz |MBBS, Medicine |
Medical Expert
Farah holds a Bachelor of Medicine and Bachelor of Surgery (MBBS) from Dow University of Health Sciences. She gained valuable experience through internships in Radiology, Cardiology, and Neurosurgery, and has contributed to two research publications in medical journals. Passionate about healthcare education, Farah excels in crafting medical content, including articles, literature reviews, and e-learning courses. Leveraging her expertise, she meticulously reviews medical science quizzes, ensuring accuracy and educational value for aspiring healthcare professionals.
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