CIC Infectious Agent Transmission 3 — Questions and Answers
Question 1: A hospital experiences a cluster of Aspergillus infections among immunocompromised patients during building renovation. What is the PRIMARY transmission concern?
- Direct contact with construction workers
- Airborne fungal spores disturbed during construction (Correct answer)
- Waterborne transmission through the plumbing system
- Vector-borne transmission from rodents displaced by construction
Correct answer: Airborne fungal spores disturbed during construction
Construction activities disturb soil and building materials, releasing Aspergillus spores that travel via air to susceptible immunocompromised hosts.
Question 2: Which droplet precaution characteristic distinguishes it from airborne precautions?
- Droplet precautions require N95 respirators instead of surgical masks
- Droplets (>5 µm) travel only short distances and fall quickly, unlike airborne particles (Correct answer)
- Droplet transmission occurs only through direct contact with mucous membranes
- Droplet precautions are used exclusively for viral pathogens
Correct answer: Droplets (>5 µm) travel only short distances and fall quickly, unlike airborne particles
Droplets >5 µm are too heavy to remain airborne for extended periods and typically travel only 3–6 feet before settling, unlike true airborne particles.
Question 3: A patient with scabies requires which type of transmission-based precautions?
- Airborne precautions
- Droplet precautions
- Contact precautions (Correct answer)
- Protective environment precautions
Correct answer: Contact precautions
Scabies mites are transmitted through prolonged direct skin-to-skin contact, requiring contact precautions including gloves and gowns.
Question 4: The incubation period of an infectious disease is most relevant to transmission prevention because it:
- Determines the duration of antibiotic therapy required
- Identifies the window during which a host may be infectious before symptoms appear (Correct answer)
- Establishes the minimum infectious dose needed to cause disease
- Defines the pathogen's environmental survival time
Correct answer: Identifies the window during which a host may be infectious before symptoms appear
During the incubation period, individuals may shed pathogens and unknowingly transmit infection before becoming symptomatic, making this period critical for outbreak control.
Question 5: Which of the following BEST describes indirect contact transmission?
- Transmission via respiratory droplets landing on mucous membranes
- Transmission through a contaminated intermediate object such as a shared blood pressure cuff (Correct answer)
- Transmission of pathogens suspended in air over long distances
- Transmission from an infected animal to a human through a bite
Correct answer: Transmission through a contaminated intermediate object such as a shared blood pressure cuff
Indirect contact transmission involves transfer of an infectious agent via a contaminated inanimate object (fomite) that serves as an intermediate vehicle.
Question 6: RSV (Respiratory Syncytial Virus) is primarily transmitted in healthcare settings through which route?
- Airborne droplet nuclei
- Large droplets and contact with contaminated surfaces (Correct answer)
- Fecal-oral route
- Vector-borne transmission
Correct answer: Large droplets and contact with contaminated surfaces
RSV spreads mainly through large respiratory droplets and direct or indirect contact with contaminated secretions on surfaces or hands.
Question 7: An infection preventionist is investigating a foodborne outbreak. Which transmission category does this represent?
- Vector-borne transmission
- Common vehicle transmission (Correct answer)
- Airborne transmission
- Direct contact transmission
Correct answer: Common vehicle transmission
Foodborne outbreaks represent common vehicle transmission, where a single contaminated source (food or water) exposes multiple susceptible hosts simultaneously.
CIC Infectious Agent Transmission 3
A hospital experiences a cluster of Aspergillus infections among immunocompromised patients during building renovation.
What is the PRIMARY transmission concern?