Increased virulence of modified-live infectious laryngotracheitis vaccine virus following bird-to-bird passage

Modified-live (ML) infectious laryngotracheitis (ILT) vaccine viruses, both tissue-culture-origin (TCO) and chicken-embryo-origin (CEO), were passaged 20 times in specific-pathogen-free chickens. After serial bird-to-bird passage, increased virulence was observed for CEO virus but not TCO virus. Inc...

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Veröffentlicht in:	Avian diseases 1991-04, Vol.35 (2), p.348-355
Hauptverfasser:	Guy, J.S. (North Carolina State University, Raleigh, NC), Barnes, H.J, Smith, L
Format:	Artikel
Sprache:	eng
Schlagworte:	Animals AVES DE CORRAL Chickens Chief executive officers CULTIVO DE TEJIDOS CULTURE DE TISSU EMBRIONES ANIMALES EMBRYON ANIMAL Herpesviridae Infections - microbiology Herpesviridae Infections - pathology Herpesviridae Infections - veterinary Herpesvirus 1, Gallid - immunology Herpesvirus 1, Gallid - pathogenicity Inoculation LARINGOTRAQUEITIS LARYNGOTRACHEITE Lesions Mortality PODER PATOGENO POLLITO Poultry Diseases - microbiology Poultry Diseases - pathology POUSSIN POUVOIR PATHOGENE Respiratory diseases Respiratory Tract Infections - microbiology Respiratory Tract Infections - pathology Respiratory Tract Infections - veterinary Serial Passage Specific Pathogen-Free Organisms Trachea Trachea - pathology VACCIN VIVANT Vaccination VACUNA VIVA Viral Vaccines - adverse effects Virulence Viruses VOLAILLE
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