Sá e Silva, Mariana Very Virulent Infectious Bursal Disease Virus Produces More-Severe Disease and Lesions in Specific-Pathogen-Free (SPF) Leghorns Than in SPF Broiler Chickens. [electronic resource] - Avian diseases Mar 2016 - 63-6 p. digital Publication Type: Journal Article ISSN: 1938-4351 Standard No.: 10.1637/11230-070615-ResNote.1 doi Subjects--Topical Terms: AnimalsBirnaviridae Infections--geneticsChickensFemaleInfectious bursal disease virus--pathogenicityPoultry Diseases--geneticsSpecific Pathogen-Free OrganismsVirulence