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Infectious Coryza: Overview of the Disease and New Diagnostic Options

Blackall, P.J. (1999) Infectious Coryza: Overview of the Disease and New Diagnostic Options. Clinical Microbiology Reviews, 12 (4). pp. 627-632.

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Publisher URL: http://journals.asm.org/

Abstract

Infectious coryza is a well-recognized and commonly encountered upper respiratory tract disease of chickens that is caused by the bacterium Haemophilus paragallinarum. The occurrence of recent outbreaks in North America has emphasized that the disease can be significant in meat chickens as well as layer chickens. In developing countries, coryza is commonly complicated by the presence of a range of other infections, resulting in severe disease and significant economic losses. Unusual forms of the disease, involving arthritis and septicemia, again associated with the presence of other pathogens, have been found in South America. Newly recognized bacteria such as Ornithobacterium rhinotracheale and phenotypic variant forms of both H. paragallinarum and close relatives (variant in that they no longer require V-factor for growth in vitro) have increased the difficulty associated with diagnosing the disease. There have been suggestions in both South America and South Africa that new serovars or serovar variants, associated with unusual clinical manifestations and causing vaccine failures, are emerging. Definitive evidence to confirm or deny the role of these "variants" in vaccine failures is currently not available. A new DNA-based diagnostic technique, involving PCR, has been recently described and will greatly assist in the diagnosis of infectious coryza.

Item Type:Article
Additional Information:Permission granted © American Society for Microbiology and Author P.J. Blackall. Access to published version may be available via Publisher’s website.
Keywords:Haemophilus paragallinarum; infectious coryza.
Subjects:Veterinary medicine > Diseases of special classes of animals > Avian
Veterinary medicine > Veterinary pathology
Veterinary medicine > Veterinary bacteriology
Deposited On:26 Mar 2004
Last Modified:07 Jun 2011 23:37

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