Nick J. Knowles* , Jemma Wadsworth*, Scott M. Reid*, Katherine G. Swabey*, Alaa A. El-Kholy†, Adel Omar Abd El-Rahman†, Hatem M. Soliman†, Katja Ebert*, Nigel P. Ferris*, Geoffrey H. Hutchings*, Robert J. Statham*, Donald P. King*, and David J. Paton*
Author affiliations: *Institute for Animal Health, Surrey, United Kingdom; †Veterinary Sera and Vaccines Research Institute, Cairo, Egypt;
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