Which interval is used for seasonal influenza vaccination in adults?

Which interval is used for seasonal influenza vaccination in adults?

• A. Every 12 months
• B. Every 18 months
• C. Every 24 months
• D. Every 36 months

Answer: (A)

The key idea is that flu vaccination is given on a yearly basis because both the virus changes each season and the protection from the vaccine wanes over time. Each year, the vaccine is reformulated to match the strains most likely to circulate, so getting vaccinated every season helps ensure you have protection against the current strains. Immunity from the vaccine tends to decline over several months, so even if you were vaccinated last year, you should receive the vaccine again this year to maintain optimal protection during the influenza season. For adults, this translates to an interval of about 12 months, ideally before flu season begins.

The key idea is that flu vaccination is given on a yearly basis because both the virus changes each season and the protection from the vaccine wanes over time. Each year, the vaccine is reformulated to match the strains most likely to circulate, so getting vaccinated every season helps ensure you have protection against the current strains. Immunity from the vaccine tends to decline over several months, so even if you were vaccinated last year, you should receive the vaccine again this year to maintain optimal protection during the influenza season. For adults, this translates to an interval of about 12 months, ideally before flu season begins.