CIC Infectious Disease Processes 4

Question 1

Which component of the innate immune system provides the first line of defense against invading pathogens?

Accepted Answer

Physical barriers such as intact skin and mucous membranes

Answer

Physical and chemical barriers—including intact skin, mucous membranes, and secretions—constitute the body's first line of innate immune defense.

Question 2

A patient with end-stage renal disease on hemodialysis develops a fever and elevated white blood cell count. Their blunted immune response is best described as:

Accepted Answer

Immunosuppression due to uremia

Answer

Uremia from renal failure causes immunosuppression by impairing neutrophil and lymphocyte function, increasing infection susceptibility.

Question 3

The concept of 'herd immunity' is most relevant to infection prevention when:

Accepted Answer

A sufficient proportion of a population is immune, reducing pathogen transmission

Answer

Herd immunity occurs when enough of the population is immune (through vaccination or prior infection) to interrupt transmission chains, protecting susceptible individuals.

Question 4

Which of the following best describes an endogenous source of healthcare-associated infection?

Accepted Answer

Patient's own flora causing infection after a procedure

Answer

Endogenous infections arise from the patient's own resident or transient flora, often introduced to normally sterile sites during invasive procedures.

Question 5

Prions differ fundamentally from other infectious agents because they:

Accepted Answer

Contain only protein and no nucleic acid

Answer

Prions are misfolded proteins with no nucleic acid (DNA or RNA), making them unique among infectious agents and extremely resistant to standard decontamination.

CIC - Certification in Infection Prevention and Control Practice Test

CIC - Certification in Infection Prevention and Control Practice Test

CIC Infectious Disease Processes 4