Prevalence, Isolation, Identification, and Risk Factors of Major Bacterial Cause of Camel Subclinical Mastitis

Abstract

Objective. A crosssectional study was conducted between September 2015 and August 2016 in the district of Afar Regional State, Northeastern Ethiopia, to characterize the most prevalent bacterial pathogens and identify the associated risk factors of camel subclinical mastitis. California mastitis test (CMT) was used as a screening test, and standard bacteriological methods were carried out for isolation and identification of the pathogens. Results. Among the total 96 lactating camels examined, 25 were found positive with the overall prevalence of 26%, with 25% and 1% subclinical and clinical mastitis cases, respectively. Totally, 384 quarters of udder were examined; of these, 10 of them were blind while the rest 374 were nonblind teats. The quarter level prevalence of subclinical mastitis was 8.9%. The analysis showed that statistically significant difference ( $P<0.05$ ) of tick infestation and subclinical mastitis. Additionally, among the bacteriologically tested 34 CMT positive milk samples, all of them showed growth on nutrient and blood agar plate. Out of these culture isolates, the major bacterial pathogens identified were Staphylococcus aureus (8.7%), Staphylococcus hyicus (6.52%), Staphylococcus intermedius (6.52), Coagulase-negative staphylococci (19.57%), Bacillus (19.57%), Escherichia coli (6.52%), and Pasteurella multocida (6.52%) species. Therefore, appropriate control measures and awareness creation to the community should be practiced.