Cleavage site stability of Egyptian highly pathogenic avian influenza viruses in backyard chickens during 2009–2011 ElBakrey, Reham M. El Sisi, Mohammed A. Mansour, Shimaa M.G. Ahmed, Heba H. Rajput, Mrigendra Eid, Amal A.M. Published in Journal of Microbiology Immunology and Infection