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Bacteriological studies on calves affected with respiratory manifestations

Bovine respiratory disease (BRD) is the most common and costly diseaseaffecting beef cattle calves in the world. The objectives of this study were to put ahigh light on epidemiology of P. multocida and M. haemolytica as important causesof bovine respiratory disease (BRD) in Egypt Governorates; Giza,El-Fayoum,BeniSuef, Assiut and Sohag. A total number of 406 deep nasal swabs and blood sampleswere collected from 406 bovine calves suffered from respiratory manifestationsreared in different Governorates in Egypt. Bacteriological examination wasachieved and isolation of P. multocida and M. haemolytica were attained. Theoverall prevalence of bothP. multocida and M. haemolytica was of 26.6%; 18.2%for P. multocida and 8.4%for M. haemolytica. EL-Fayoum Governorate showed thehighest prevalences while Beni-Suef Governorate showed the lowest prevalences.P. multocida was singly isolated from 4.9% of cases. While it was mixed with S.aureus, E. coli, Streptococcus spp., both S. aureus and E. coli, both S. aureus andStreptococcus spp. and both E. coli and Streptococcus spp. with percentages of4%, 1.2%, 2.2%, 1.7%, 3.2% and 1.0%, respectively. Meanwhile, M. haemolyticawas isolated as a single isolate from 1.7% of cases while it was mixed with S.aureus, Streptococcus spp., both S. aureus and Streptococcus spp. and both E. coliand Streptococcus spp. with percentages of 2.7%, 1.2%, 2.5% and 0.2%,respectively. In conclusion respiratory manifestations are very important disordersin bovine calves. P. multocida and M.haemolytica are the most common bacteriacausing infection.