Which statement about influenza vaccination is true?

Which statement about influenza vaccination is true?

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

Answer: (A)

Vaccines for influenza are given once each flu season. Each year the vaccine is reformulated to match the strains expected to circulate, and the protective immune response wanes over time, so a new vaccination is needed annually to maintain protection. For most people, one dose per season provides the needed protection; a second dose during the same season is only considered for a small subset of children getting vaccinated for the first time, and not multiple doses spread across different years. That’s why the statement about one dose annually is the true one.

Vaccines for influenza are given once each flu season. Each year the vaccine is reformulated to match the strains expected to circulate, and the protective immune response wanes over time, so a new vaccination is needed annually to maintain protection. For most people, one dose per season provides the needed protection; a second dose during the same season is only considered for a small subset of children getting vaccinated for the first time, and not multiple doses spread across different years. That’s why the statement about one dose annually is the true one.