Case report of recovery from theileriosis in five dairy cows naturally infected with theileria orientalis

Theileria orientalis is an opportunistic pathogen affecting cattle in most continents, with manifestations ranging from latent infection to severe hemolytic anemia. This report describes the hematological changes during recovery from hemolytic anemia in dairy cows. Oxytetracycline and buparva- quone were administered. Red blood cell count began to increase a few days after the administration of antibiotics. This may indicate the damaged erythrocytes undergoing phagocytosis more than the newly produced erythrocytes for a short period after the first treatment. Although the hematocrit values normalized by about a month, other hematological values took longer to become normal.