Why might humans need yearly vaccination for influenza?
A) There has been an increase in immunodeficiency diseases.
B) Influenza typically causes anaphylactic shock.
C) Memory B cells die out after one year.
D) Influenza virus undergoes rapid mutation that alters the surface proteins in the cells it infects.
E) Influenza initiates autoimmune disorders.

Question

Quizplus · Accepted Answer

Influenza virus undergoes rapid mutation that alters the surface proteins in the cells it infects, which makes it difficult for the immune system to recognize and fight off the virus from previous infections. Therefore, yearly vaccination is required to protect individuals from new strains of the virus.

Why Might Humans Need Yearly Vaccination for Influenza