Increasing West Nile virus antibody titres in central European plasma donors from 2006 to 2010 Rabel, P O and Planitzer, C B and Farcet, M R and Orlinger, K K and Ilk, R and Barrett, P N and Kreil, T R, Eurosurveillance, 16, 19812 (2011), https://doi.org/10.2807/ese.16.10.19812-en