Campylobacters showed a marked increase in their incidence in diarrheic cows (2l .2%) than apparently healthy ones (15 .1%). A great difference could be detected in carriage rates between healthy and diarrhoeal buffaloes. Incidence in diarrhoeic buffaloes was considerably higher than in those with no obvious signs of enteritis (l3.l% Vs 4.4%). C. jejuni and C. coli were found in higher incidence in bovine with diarrhoea than in those without. Also, C. laridis was present only in diarrhoeic cows but not in the rectal samples obtained from examined buffaloes. Many campylobacters did not grow onto blood - free selective medium but mostly appeared onto blood containing selective medium. The combination of both media is therefore necessary to ensure the maximum isolation of campylobacters from feces. It was best to treat diarrhoea in cows or buffaloes due to campylobacter infection by using chloramphenicol, oxytetracycline, neomycin or erythromycin. On The contrary, penicillin - G, streptomycin and sulphonamides should be avoided.