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Puumala virus prevalence in local vole populations and human infections in the larger region. (A) Number of voles sampled and PUUV prevalence in each year for all sites in the study together. (B) PUUV human infections registered per year in the Osnabrück district and in the encompassing German federal states Niedersachsen (NI) and Nordrhein-Westfalen (NW) pooled together [data from Robert Koch-Institut (2013)].
