In public health, which vaccine is recommended annually?

• A. Influenza vaccine
• B. Pneumococcal vaccine
• C. MMR
• D. Hepatitis B

Answer: (A)

The main idea is that only the influenza vaccine is updated and recommended every year because the flu virus changes rapidly. Influenza undergoes frequent antigenic drift, so the strains circulating each season can be different from last year. Public health authorities reformulate the vaccine annually to match the predicted circulating strains, aiming to reduce illness, hospitalizations, and deaths across the population.

Other vaccines follow fixed schedules and are not redesigned yearly. Pneumococcal vaccines are given as specified dosing in childhood or for adults at risk, not annually. MMR provides long-term immunity after a couple of doses given in childhood, and Hepatitis B is given as a multi-dose series over months. Their protection does not require yearly updates, so they aren’t described as annual vaccines.