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. 2017 Feb;23(2):212–219. doi: 10.3201/eid2302.161058

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Rate of West Nile virus (WNV)–positive blood donations by month, United States, June–October 2010–2012. Overall, 640 WNV-positive donations were confirmed by nucleic acid testing in 10,107,853 screened donations. Positive donations collected during the months of January–May (1 in April 2010) and November–December (3 in November 2012) are not shown.