Aerobic bacterial pathogens of pneumonic feedlot buffalo-calves, in Assiut governorate, Egypt

الملخص EN

The current study conducted on 68 lung samples from 1-3 years old buffalo-calves slaughtered at Assiut abattoirs.

The samples showed variable gross lesions of pneumonia in particular the grey and red hepatization.

The bacteriological examinations indicated that 66 (97.06%) samples of the examined lungs were positive for mixed bacterial isolation, while the other two samples (2.94%) found to be bacteriologically negative.

Staphylococcus aureus (22.43%); Escherichia coli (18.22%) and Pasteurella multocida (15.89%) were the predominant isolated bacterial pathogens.

However, Proteus vulgaris (7.01%); Streptococcus.

pyogenes (5.61%) ; Actinomyces pyogenes (3.74%) ; Klebsiella pneumonia (3.27%) and Corynebacterium bovis (2.8%) were also isolated.

Pasteurella multocida were isolated from pulmonary tissues and their virulence and pathogenicity test revealed that all injected mice were died at various time-intervals, from less than 24 hours up to 48 hours, with 100% mortality rates.