Przegl Epidemiol, vol. From the centres from disease control and prevention update influenza activity United States and worldwide 1992-93 season. Genetic reassortment between avian and human influenza-A viruses in Italian pigs. Bull Hist Med, vol. Sharp, G. B. et al.
Wild ducks are the reservoir for only a limited number of influenza A-subtypes.
Epidemiol Infect, vol. J Gen Virol, vol. The influence of beta-propiolactone on immunogenic and protective activities of influenza virus. Cossins, J. et al. Eljaafari, A. et al.