infection rates in cattle with any clinical problems or macroscopic pathological lesions and in apparently normal animals [0.001
infection and sex and body condition score. With omitting the animals with any clinical problems or macroscopic pathological lesions and stressed ones, because of probability of the secondary changes in hematological indications of them, seropositive cattle had higher total leukocyte counts [0.01
T-lymphocyte [CD4+] percentage [0.01
cattle. In addition there was a positive correlation between the number of B-lymphocyte [CD21+] and total leukocyte counts and lymphocyte percentage in seropositive cattle. Results of this study depicted high seroprevalence rate of Enzootic Bovine Leukosis Virus infection in the surveyed animals and lower CD4+-cells percentage in seropositive cattle than seronegative ones