Hematological findings in this study revealed a marked decrease in the mean levels of RBCs, HCT%, Hb and MCHC and increase in MCV values in cattle infected with B. bovis and/or B. bigemina regardless of the method of detection (Blood film, cELISA, and PCR) used in this study, and even assuming that these parameters can be affected in these animals due to other unknown reasons different from Babesia infections. The gene discussed is GSTM1; the disease is babesiosis.