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Virulence of infectious laryngotracheitis viruses: comparison of modified-live vaccine viruses and North Carolina field isolates



Virulence of infectious laryngotracheitis viruses: comparison of modified-live vaccine viruses and North Carolina field isolates



Avian Diseases 34(1): 106-113



The virulence of six modified-live (ML) infectious laryngotracheitis (ILT) vaccine viruses was compared with that of 11 field isolates (indistinguishable from vaccine viruses by DNA restriction endonuclease analyses) by intratracheal exposure of 4-week-old, specific-pathogen-free chickens. The virulence of ILT viruses was based on an intratracheal pathogenicity index, mortality, and tracheal lesions.

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Accession: 002000913

Download citation: RISBibTeXText

PMID: 2157386

DOI: 10.2307/1591340



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