Influenza-related mortality trends in japanese and american seniors: Evidence for the indirect mortality benefits of vaccinating schoolchildren

Vivek Charu*, Cecile Viboud, Lone Simonsen, Katharine Sturm-Ramirez, Masayoshi Shinjoh, Gerardo Chowell, Mark Miller, Norio Sugaya

*Corresponding author

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review


The historical Japanese influenza vaccination program targeted at schoolchildren provides a unique opportunity to evaluate the indirect benefits of vaccinating high-transmitter groups to mitigate disease burden among seniors. Here we characterize the indirect mortality benefits of vaccinating schoolchildren based on data from Japan and the US.

We compared age-specific influenza-related excess mortality rates in Japanese seniors aged ≥65 years during the schoolchildren vaccination program (1978–1994) and after the program was discontinued (1995–2006). Indirect vaccine benefits were adjusted for demographic changes, socioeconomics and dominant influenza subtype; US mortality data were used as a control.

We estimate that the schoolchildren vaccination program conferred a 36% adjusted mortality reduction among Japanese seniors (95%CI: 17–51%), corresponding to ∼1,000 senior deaths averted by vaccination annually (95%CI: 400–1,800). In contrast, influenza-related mortality did not change among US seniors, despite increasing vaccine coverage in this population.

The Japanese schoolchildren vaccination program was associated with substantial indirect mortality benefits in seniors.
TidsskriftP L o S One
Udgave nummer11
StatusUdgivet - 2011
Udgivet eksterntJa

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