Following an outbreak of West Nile virus (WNV) infections in Greece during summer/autumn 2010, a study was conducted to investigate the patterns of WNV IgG reactivity in 255 patients with respect to the day of illness and the type of clinical syndrome. IgG antibodies were detectable after a mean of 8.1 ± 4.9 and 12.6 ± 11.3 days after onset of illness in neuroinvasive and non-neuroinvasive cases, respectively (p < 0.001), suggesting that a delay in the development of WNV IgG antibodies is seen in non-neuroinvasive cases.
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