Which statement correctly describes the influenza vaccination schedule?

Which statement correctly describes the influenza vaccination schedule?

• A. Two doses per year
• B. One dose annually
• C. Three doses per season
• D. Four doses per year

Answer: (B)

Influenza vaccination is given once each year because flu viruses change from year to year and immunity from the vaccine wanes over time. Each season, scientists update the vaccine to better match the strains expected to circulate, so the protection you get is timed for that specific influenza season. For most people, one dose per season provides the needed protection. There is an exception for some young children receiving flu vaccine for the first time, who may need two doses at least four weeks apart to build adequate protection. In short, yearly vaccination aligns with the changing virus and the duration of the immune response, making one dose per season the standard.

Influenza vaccination is given once each year because flu viruses change from year to year and immunity from the vaccine wanes over time. Each season, scientists update the vaccine to better match the strains expected to circulate, so the protection you get is timed for that specific influenza season. For most people, one dose per season provides the needed protection. There is an exception for some young children receiving flu vaccine for the first time, who may need two doses at least four weeks apart to build adequate protection. In short, yearly vaccination aligns with the changing virus and the duration of the immune response, making one dose per season the standard.