Flu Vaccine Prevents 9 to 14 Infections Per 100 Vaccinated Children: Harvard Study

A recent study conducted by Harvard Medical School researchers indicates that flu vaccines substantially decrease influenza infections in young children. The research, which appeared in JAMA Pediatrics, demonstrates that vaccinating 100 children prevents nine to 14 of them from contracting the flu.

The study employed a birthday-based analysis to assess the effectiveness of flu vaccines in children aged two to five. The researchers examined data from a large sample of children who received flu shots and compared their infection rates with those who were unvaccinated. The results consistently showed a marked reduction in flu cases among the vaccinated group, reinforcing the importance of childhood flu vaccination programs.

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Date: June 1, 2026

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