Bacteriological and serological studies on Mannheimia haemolytica infection in cattle slaughtered at Ahvaz (southwestern Iran) abattoir

Document Type : Short paper

Authors

1 Department of Clinical Sciences, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Department of Pathobiology, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran

3 Graduated from Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran

4 Department of Microbiology, Razi Vaccine and Serum Research Institute, Karaj, Iran

Abstract

In order to investigate the prevalence of Mannheimia haemolytica infection in cattle, nasal and
nasopharyngeal swabs and blood samples were obtained from 250 cattle after slaughter at Ahvaz
(southwestern Iran) abattoir. Nasal and nasopharyngeal swabs were cultured on blood agar and incubated at
37°C for 24-48 h. The suspected bacterial cultures were processed for isolation of M. haemolytica following
routine bacteriological techniques. Sera were tested by indirect hemagglutination test (IHA) to reveal
antibodies against the organism. M. haemolytica was isolated from 1.6% of the sampled cattle. Statistical
analysis showed that there was no relationship between age and sex with bacterial infection. Serological
studies showed that 71.6% of tested sera contained antibody (titer≥1/16) against M. haemolytica. There was
no association between age and sex with serological results.

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