STUDY OF OVINE PASTEURELLOSIS IN HIGHLANDS OF SOUTH WOLLO ZONE OF THE AMHARA REGION, ETHIOPIA
No Thumbnail Available
Date
2007-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The study of ovine pasteurellosis was conducted in highland woredas of South Wollo zone of the Amhara region to determine the prevalence rate of Mannheimia haemolytica, Pasteurella trehalosi and Pasteurella multocida from nasal swabs (120) abattoir specimen’s tonsils (75) and lungs (75), and the serotype diversity amongst species from sheep sera (200). A total of 71 (26. 3 %) isolates of M. haemolytica, P. trehalosi and P. multocida were isolated from nasal swabs of apparently health and moribund sheep, pneumonic lungs and the same numbers from their corresponding tonsils samples. The P. trehalosi was isolated from the nasal swabs (12.5 %) and tonsils (16 %), whereas M. haemolytica isolates from pneumonic lungs (20 %), whereas Pasteurella multocida was the lowest among species isolated (1.8 %). The overall isolation rate of M. haemolytica and P. trehalosi was 11.1% and 13.4%, respectively. There was no significant difference (p>0.05) between isolates of M. haemolytica and P. trehaosi from samples from sheep. Monthly isolation rates of Mannheimia and Pasteurella spp from pneumonic lungs and tonsils were conducted for a period of three months (November-January). The isolates of Mannheimia and Pasteurella species from pneumonic lungs and tonsilar tissues showed higher incidence rate of 44% and 40% in the month of December, and lower rate of 22% and 16% during the month of January, respectively. There was significant difference (P< 0.01) observed between the study months. A total of 200 sheep sera were examined for serotype specific antibodies using indirect haemagglutination test for 11 M. haemolytica serotypes. Variation in prevalence among the different serotypes was observed (P< 0.001). The IHA test revealed that serotype A2, A5 and A11 were the dominant serotypes with 34.5%, 33.5% and 27.5% positive by IHA whereas serotypes A9, A13 and A14 were the least positive with 8.5%, 6.5% and 5.5% respectively.
Description
Keywords
Mannheimia haemolytica, nasal swabs Pasteurella trehalosi, pneumonia, serotypes