A population-based influenza surveillance study (using PCR virus subtyping) on Izu-Oshima Island, Japan, found that the cumulative incidence of influenza A(H1N1)pdm09 virus infections 2 seasons after the pandemic was highest for those 10-14 years of age (43.1%). No postpandemic A(H1N1)pdm09 case-patients had been infected with A(H1N1)pdm09 virus during the pandemic season.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3559151PMC
http://dx.doi.org/10.3201/eid1811.111681DOI Listing

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