Abstract
A serological survey on the prevalence of antibodies against Salmonella and Mycoplasma gallisepticum (MG) was carried out in layer chickens in Rajshahi and surrounding districts of Bangladesh. A total of 605 sera samples were examined by rapid plate agglutination (RPA) test using commercial Salmonella and MG antigens to determine the Salmonella and MG specific antibodies. Out of 605 sera samples 14.05% had single Salmonella, 45.12% had single MG and 11.24% had their concurrent infection. Prevalence of Salmonella was recorded the highest (37.60%) in adult compared to young (16.66%). On the contrary, MG and their concurrent infections were recorded the highest (71.66% and 13.33%) in young compared to adult (50.40% and 10.40%). The prevalence of Salmonella, MG and their concurrent infections were recorded the highest (34.28%, 68.57% and 17.14%) in large flocks compared to small flocks (21.25%, 50% and 8.75%). The prevalence of Salmonella infection was the highest (30.37%) in summer followed by winter (23.69%), rainy (25%) and autumn (23.33%). The prevalence of MG infection was the highest (61.58%) in winter followed by autumn (56.88%), rainy (55%) and summer (49.63%). Whereas, their concurrent infection was the highest (12.11%) in winter followed by summer (11.85%), rainy (10.83%) and autumn (10%).
Highlights
Salmonellosis is an important disease in chickens caused by Salmonella pullorum and Salmonella gallinarum and is referred to as pullorum disease and fowl typhoid, respectively
Pullorum disease occurs in chicks during their first few days of life and causes severe enteritis and bacteremia (Snoeyenbos et al, 1994)
Fowl typhoid is a disease of mature chickens and causes either acute enteritis with greenish diarrhea or a chronic disease of the genital tract that reduces egg production (Proux et al, 2002)
Summary
Salmonellosis is an important disease in chickens caused by Salmonella pullorum and Salmonella gallinarum and is referred to as pullorum disease and fowl typhoid, respectively. MG infection is a chronic respiratory disease (CRD) in avian species (Ley, 2003) transmitted both horizontally and vertically and it remains in the flock continuously as a subclinical form (Bencina et al, 1987). It causes decreased feed efficiency, poor carcass quality and sub-optimal egg production in layers (Ley and Yoder, 1997). It is important to know the status of salmonellosis, mycoplasmosis and their concurrent infections in chickens to take an effective control measure
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