Abstract
Aim:This study was carried out for the detection of Avibacterium paragallinarum from outbreaks of infectious coryza of poultryMaterials and Methods:The polymerase chain reaction (PCR) was standardized for the diagnosis of infectious coryza by using infectious coryza Killed vaccine, ventri biologicals, Pune as source of DNA of A. paragallinarum. Five outbreaks of infectious coryza from Andhra Pradesh were investigated in the present study. A total of 56 infra orbital sinus swabs and 22 nasal swabs were tested by PCR.Results:PCR analysis showed 56 positives (71.7%) for infectious coryza out of total 78 samples tested. Of 56 infra orbital sinus swabs tested, 47 were positive (83.9%) and 9 nasal swabs (40.9%) out of 22 tested had given positive results for infectious coryza. Samples collected from birds at acute stage of disease and samples collected before treatment with antibiotics were given better results on PCR.Conclusion:For preventing the economic losses associated with the disease, an early, accurate and rapid diagnosis is essential. PCR is a rapid and highly sensitive diagnostic technique which can substitute conventional cultural examination.
Highlights
A group of respiratory diseases, often called as respiratory disease complex which produces closely resembling symptoms, mixed infections of respiratory system with multiple etiologies are contributing to the complexity in the proper diagnosis and differentiation of respiratory diseases
Samples collected from birds at acute stage of disease and samples collected before treatment with antibiotics were given better results on polymerase chain reaction (PCR)
For preventing the economic losses associated with the disease, an early, accurate and rapid diagnosis is essential
Summary
A group of respiratory diseases, often called as respiratory disease complex which produces closely resembling symptoms, mixed infections of respiratory system with multiple etiologies are contributing to the complexity in the proper diagnosis and differentiation of respiratory diseases. Infectious coryza is a respiratory disease of chickens caused by the bacterium, Avibacterium paragallinarum primarily affecting upper respiratory tract, including the involvement of nasal passages, infra orbital and paranasal sinuses. Infectious coryza is a cosmopolitan disease, which has been reported from all around the world where chickens are raised including India. The economic losses associated with infectious coryza results from poor growth performance in growing birds including broilers, marked reduction (10-40%) in egg production in layers and increased culling rates in meat chickens. Infected birds or recovered healthy birds act as reservoirs of infection in a population and makes the disease endemic in an area [1,2]. The disease is recognized as a cause of significant loss to the poultry industry all over the world. For reducing the economic losses associated with this disease, early, rapid and accurate diagnosis is essential
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