Bovine Leukosis, Bovine Viral Diarrhea and Infectious Bovine Rhinotracheitis are among the main viruses that lead to losses in productivity and reproductive performance of ruminants. Although cattle and buffalo are often created together, and despite the proven occurrence of these diseases in buffalo, papers about natural occurrence of these infections in this species are scarce. Thus, the objective of this study was to verify the occurrence of antibodies against the Bovine Leukosis Virus (BLV), Bovine Viral Diarrhea (BVD) and Infectious Bovine Rhinotracheitis (IBR) in buffalo creations located in the “Paraense” Northeast Mesoregion, Greater Metropolitan Belém and Marajó Mesoregion, Pará, in addition to identify the risk factors for BVD in creations located in “Paraense” Northeast Mesoregion and Greater Metropolitan Belém. In this study 350 buffaloes (Bubalus bubalis) sera were evaluated, coming from farms located in each mesoregion, that were subjected to serological techniques: immunodiffusion for (BLV) and serum neutralizing for BVD and IBR. Frequency of the respective diseases in the study population were: 0% (0/350), 53,71% (188/350) and 91,71% (321/350). Male buffaloes and older animals had higher seropositivity for BVD. The frequency of BVD seroreagents buffaloes was higher in Marajó Mesoregion compared to “Paraense” Northeast Mesoregion and Greater Metropolitan Belém, whereas for IBR the opposite occurred. Among the variables investigated, the type of milking was the only identified as a risk factor for the occurrence of BVD in buffaloes.
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