CBIC Outbreak Investigation 4

Question 1

During an outbreak investigation, a 'hypothesis-generating interview' is conducted to:

Accepted Answer

Broadly explore exposures before formulating a specific hypothesis

Answer

Hypothesis-generating interviews use open-ended questions to explore all potential exposures before a formal analytical study is designed.

Question 2

A prolonged common-source outbreak with intermittent exposures produces which epidemic curve pattern?

Accepted Answer

Irregular, scattered cases over an extended period

Answer

Intermittent common-source outbreaks show irregular, scattered case distributions because exposures occur at different times and doses.

Question 3

Which agency must be notified when a healthcare facility identifies a novel or emerging pathogen cluster that poses a public health threat?

Accepted Answer

State or local health department

Answer

State and local health departments are the primary mandatory reporting recipients for novel or reportable communicable disease clusters in healthcare settings.

Question 4

An IP is investigating a cluster of post-operative endophthalmitis cases. Cultures grow Pseudomonas aeruginosa from all cases. The NEXT priority step is to:

Accepted Answer

Identify common exposures: surgeon, procedure, instruments, or solutions

Answer

Identifying shared exposures among cases (same surgeon, instrument set, or irrigating solution) is the critical next step to pinpoint the source.

Question 5

The concept of 'herd immunity threshold' is most relevant during an outbreak investigation when:

Accepted Answer

Estimating the vaccination coverage needed to halt transmission

Answer

The herd immunity threshold tells investigators what proportion of the population must be immune to interrupt sustained transmission of the pathogen.

CBIC - Certification Board of Infection Control Practice Test

CBIC - Certification Board of Infection Control Practice Test

CBIC Outbreak Investigation 4