Which influenza vaccine is more effective in children aged 2–6 years?

• A. Live Attenuated Intranasal Influenza Vaccine
• B. Inactivated Influenza Vaccine
• C. Both Equally Effective
• D. Neither Provides Protection

Answer: (A)

In children aged 2–6 years, the vaccine that mimics a natural infection in the respiratory tract tends to provide stronger protection because it stimulates mucosal immunity in addition to systemic immunity. The live attenuated intranasal vaccine replicates in the nasal passages, triggering mucosal IgA along with broader immune responses. This local defense at the site where influenza first enters helps reduce infection and transmission more effectively in this age group than an injected inactivated vaccine, which mainly prompts systemic antibodies. The intranasal option also has practical advantages that can improve uptake in young children. For these reasons, the live attenuated intranasal influenza vaccine is the better choice for children 2–6 years old.