Question

question 40 1 pts vaccines provide protection from infection from a pathogen for a certain length of time. this period is called the onset of immunity. duration of immunity. primary exposure. titer.

Explanation:

The period for which vaccines provide protection from pathogen - induced infection is the time - length of immunity. Onset of immunity refers to when immunity starts, primary exposure is the first encounter with a pathogen, and titer is a measure of antibody concentration.

Answer:

B. duration of immunity