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Number of positive bird serum samples verified by WNV and USUV VNT and the calculated seroprevalence for WNV and USUV in the three different study regions (A–C) in Germany in 2019 and 2020. The results for 2019 are shown on the left and for 2020 on the right. Serological results for 2019 include nine clinically affected free-ranging goshawks, which were published previously [56].
