Which statement is true about vaccines such as the influenza vaccine?

Which statement is true about vaccines such as the influenza vaccine?

• A. The influenza vaccine targets measles.
• B. The influenza vaccine targets seasonal flu.
• C. The influenza vaccine is not recommended for adults.
• D. The influenza vaccine provides immediate immunity within hours.

Answer: (B)

Vaccines train the immune system to recognize specific pathogens, building protection over time rather than giving immediate immunity. For influenza, the vaccine is formulated each year to match the strains expected to circulate, so it specifically targets seasonal flu. That makes the statement true. The other ideas don’t fit: vaccines for influenza do not target measles (that’s a different vaccine, the MMR/MMRV). The influenza vaccine is recommended for adults, with rare exceptions, so saying it isn’t recommended is incorrect. Immunity does not respond within hours; it typically takes about one to two weeks after vaccination for the body to develop protective antibodies.

Vaccines train the immune system to recognize specific pathogens, building protection over time rather than giving immediate immunity. For influenza, the vaccine is formulated each year to match the strains expected to circulate, so it specifically targets seasonal flu.

That makes the statement true. The other ideas don’t fit: vaccines for influenza do not target measles (that’s a different vaccine, the MMR/MMRV). The influenza vaccine is recommended for adults, with rare exceptions, so saying it isn’t recommended is incorrect. Immunity does not respond within hours; it typically takes about one to two weeks after vaccination for the body to develop protective antibodies.