Why does the influenza virus cause recurrent infection in individuals?
A) Elderly patients are predisposed to secondary infections.
B) The virus is transmitted by numerous routes.
C) The virus is very difficult to destroy.
D) Viral mutation reduces immunity from prior infections.

Question

Quizplus · Accepted Answer

The influenza virus undergoes frequent mutations, particularly in its surface proteins, which can alter its antigenic properties. This antigenic drift reduces the effectiveness of the immune response generated from previous infections, leading to recurrent infections.

Why Does the Influenza Virus Cause Recurrent Infection in Individuals