The development and persistence of anti-West Nile Virus (WNV) immunoglobulin G (IgG)- and IgM-specific antibodies were investigated in 68 asymptomatic blood donors (BDs) previously tested as positive between October, 2008, and September, 2009, and living in northeastern Italy. Our study showed that WNV-specific IgG titers became negative (41%) or decreased (33%) in a large percentage of BDs, while they increased in a smaller percentage (10%); 16% of BDs showed no titer variation. Reversion to seronegative status within a short time frame suggests that WNV surveillance should be maintained year after year.
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| http://dx.doi.org/10.1089/vbz.2012.1157 | DOI Listing |
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