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Virulence of the Nine Serovar Reference Strains of Haemophilus paragallinarum

Soriano, V.E. and Longinos, G.M. and Fernandez, R.P. and Velasquez, Q.E. and Ciprian, C.A. and Salazar-Garcıa, F. and Blackall, P.J. (2004) Virulence of the Nine Serovar Reference Strains of Haemophilus paragallinarum. Avian Diseases, 48 (4). pp. 886-889.

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Abstract

The virulence of the reference strains of the nine currently recognized Kume serovars of Haemophilus paragallinarum was investigated. The capacity of the H. paragallinarum strains to cause the typical clinical signs of upper respiratory tract disease associated with infectious coryza in unvaccinated, nasal-challenged chickens was assessed. Differences in virulence were assessed by means of a standardized scoring system for clinical signs. All nine strains were pathogenic to chickens, producing typical clinical signs of infectious coryza. The highest clinical signs score was obtained for serovar C-1 (1.72), while the lowest clinical signs score was obtained for serovar C-4 (0.32). Our results indicate that virulence differences exist among the serovars of H. paragallinarum.

Item Type:Article
Additional Information:© American Association of Avian Pathologists.
Keywords:Haemophilus paragallinarum; infectious coryza; serovars; pathogenicity; virulence.
Subjects:Veterinary medicine > Diseases of special classes of animals > Avian
Deposited On:05 Jan 2006
Last Modified:23 Jun 2011 02:04

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