Question

The time interval between receipt of infection and the point of maximum infectivity of the host is known as?

• A. Incubation period
• B. Serial interval
• C. Generation time
• D. Communicable period

Hint:

It is the transmission interval that roughly equals the incubation period.

Answer 1

The Correct Option is C

Step 1: The key phrase is the gap between when the host receives the infection and when that host becomes maximally infectious to others.

Step 2: This interval is defined as the generation time. It describes how quickly an infected person reaches peak ability to transmit the agent onward, and it is roughly equal to the incubation period for many infections.

Step 3: Why the distractors are wrong. The incubation period is the time from infection to the first appearance of clinical signs or symptoms, not to peak infectivity. The serial interval is the gap between onset of symptoms in a primary case and onset in the secondary cases it infects. The communicable period (period of infectivity) is the whole span during which the agent can be transmitted, not a single point of maximum infectivity.

Step 4: Therefore the correct answer is generation time. (Ref: Park, 22nd edition, p. 96)