Every Year the Flu Vaccine Is Designed to Protect Against

Every year the flu vaccine is designed to protect against three different strains of the influenza virus.Why do scientists typically have to make a new vaccine every year?

A) because our bodies develop resistance to the vaccine and it becomes less effective
B) because the viruses develop resistance to the vaccine
C) because the viruses can mutate into new strains
D) because people change their habits each year and become susceptible to different strains of the virus
E) because a vaccine breaks down after one year

Correct Answer:

Verified

Unlock this answer now
Get Access to more Verified Answers free of charge

Access For Free