The present study held to investigate the relationship between azurophilic granules in the peripheral blood leukocytes and
bovine theileriosis. A total number of 100 adult cattle of different sexes were subjected to this study. Whole blood, blood
and lymph smears were collected from each animal under study. Theileria annulata was confirmed by both conventional
and molecular methods. The obtained results revealed that the percentages of interaerythrocytic stage (Signet Ring),
azurophilic granules and Koch’s blue bodies in the samples of the examined cattle were 28%, 42% and 39%, respectively.
Evaluation of the reliability of azurophilic granules occurrence in peripheral blood leukocytes as novel method for diagnosis
of tropical theileriosis revealed that the occurrence of these granules should be considered as an easy, inexpensive and
rapid method for diagnosis of bovine theileriosis.