Which of the following is the first-line vaccine for preventing influenza in the elderly
Question : Which of the following is the first-line vaccine for preventing influenza in the elderly?
A. Inactivated influenza vaccine (IIV)
B. Live attenuated influenza vaccine (LAIV)
C. Recombinant influenza vaccine (RIV)
D. Subunit influenza vaccine (SIV)
Answer: A
Explanation: The inactivated influenza vaccine (IIV) has a good safety profile and immunogenicity, and is recommended as the first-line vaccine for the elderly (≥65 years old) by the Korean Centers for Disease Control and Prevention (KCDC). LAIV is not recommended for the elderly due to reduced immune response; RIV and SIV are alternatives but not first-line. Thus, the correct answer is A.
