Cost effectiveness of trivalent and quadrivalent influenza vaccines in 50- to 64-year-old adults in Korea

•The National Immunization Program (NIP) funds influenza vaccination in the elderly and children.•The NIP is considering an expansion to include the age group 50-64 years.•We found both TIV and QIV were cost-effective in this age group.•QIV results in a wider protection than the TIV.•We recommend QI...

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