Bovine babesiosis in northern Mexico.

The occurrence of Boophilus microplus infections accompanied by bovine babesiosis was confirmed for 2 locations in northern Mexico. The confirmation at one location was made by transferring whole blood to a splenectomised calf which subsequently developed an acute Babesia bovis infection. Examination of thin blood smears from a suspect animal at the second location revealed B. bovis-infected erthrocytes. A serological survey of other herd members at both locations showed antibody activity against both Babesia and Anaplasma spp.