Comparing introduction to Europe of highly pathogenic avian influenza viruses A(H5N8) in 2014 and A(H5N1) in 2005 Adlhoch, C and Gossner, C and Koch, G and Brown, I and Bouwstra, R and Verdonck, F and Penttinen, P and Harder, T, Eurosurveillance, 19, 20996 (2014), https://doi.org/10.2807/1560-7917.ES2014.19.50.20996