Question:
Which vaccine to be given every year?
Which vaccine to be given every year?
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Which vaccine targets a virus that drifts every season?
Updated On: Jun 23, 2026
- Hepatitis A
- Hepatitis B
- Influenza
- Chicken pox
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The Correct Option is C
Solution and Explanation
Step 1: The influenza virus changes its surface antigens frequently (antigenic drift), so the vaccine is reformulated each season.
Step 2: Because of this, the influenza (flu) vaccine is recommended annually for everyone 6 months and older. Children under 9 receiving it for the first time need two doses a month apart; thereafter a single yearly dose suffices.
Step 3: Therefore influenza is the once-a-year vaccine. Hepatitis A, hepatitis B and varicella (chicken pox) are given as fixed multi-dose primary schedules, not annually.
Step 2: Because of this, the influenza (flu) vaccine is recommended annually for everyone 6 months and older. Children under 9 receiving it for the first time need two doses a month apart; thereafter a single yearly dose suffices.
Step 3: Therefore influenza is the once-a-year vaccine. Hepatitis A, hepatitis B and varicella (chicken pox) are given as fixed multi-dose primary schedules, not annually.
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