H7N7 Avian Influenza Virus Mutation from Low to High Pathogenicity on a Layer Chicken Farm in the UK von Byrne, Alexander M P, Reid, Scott M, Seekings, Amanda H, Núñez, Alejandro, Obeso Prieto, Ana B, Ridout, Susan, Warren, Caroline J, Puranik, Anita, Ceeraz, Vanessa, Essen, Stephen, Slomka, Marek J, Banks, Jill, Brown, Ian H, Brookes, Sharon M

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