title: Effects of three avian respiratory viruses on pathogenicity in tracheal organ cultures.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D002645:Chickens; D002923:Cilia; D003332:Coronaviridae / Q000472:pathogenicity*; D006564:Herpesviridae / Q000472:pathogenicity*; D001352:Herpesvirus 1, Gallid / Q000472:pathogenicity*; D001351:Infectious bronchitis virus / Q000472:pathogenicity*; D009522:Newcastle disease virus / Q000472:pathogenicity*; D009924:Organ Culture Techniques; D014132:Trachea; D014774:Virulence