Question

Which vaccine to be given every year?

• A. Hepatitis A
• B. Hepatitis B
• C. Influenza
• D. Chicken pox

Hint:

Which vaccine targets a virus that drifts every season?

Answer 1

The Correct Option is C

Step 1: Vaccines that confer durable immunity are given as a finite series, whereas a vaccine against a constantly mutating pathogen must be repeated regularly.
Step 2: Influenza fits the latter group - the circulating strains shift annually, so a freshly matched flu shot is advised every year from 6 months of age, with first-time young children needing an initial two-dose priming.
Step 3: Hepatitis A, hepatitis B and chicken pox vaccines follow set schedules and are not repeated yearly, so they are incorrect.
\[\boxed{\text{Influenza}}\]