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Virulence Pattern of Avibacterium paragallinarum Isolates Studied from Indian Field Condition

Vihang Vithalrao Patil Debendranath Mishra Dilip Vithalrao Mane
Vol 7(2), 201-207

The virulence pattern of Avibacterium paragallinarum isolates from Indian field conditions demonstrates the existences of all three serotypes i.e. serotype A, B and C was studied. Bragg’s ‘in-contact’ challenge model was applied to study the virulence pattern of these fifteen field isolates. In this model, one bird from each group (10 birds / group) was challenged with pathogen suspension and left for natural infection in the group. The substantial disease causing ability was observed in all field isolates except, one isolate belonging to serotype A. It was also further observed that, isolates belonging to serotype C are more virulent than isolates from serotype A and B. First time serotype B of Avibacterium paragallinarum was found from Indian field isolates. Similar to natural infection pattern, most of the isolates showed two disease peaks in their disease profile. Elevated virulence and variations in virulence pattern among field isolates of Avibacterium paragallinarum indicate the change in prevalence of this pathogen and emergence of potent variants of Avibacterium paragallinarum in India.

Keywords : Avibacterium paragallinarum ‘In-contact’ Challenge Model India Infectious Coryza Poultry Virulence

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