Figure 1. A: Polymerase chain reaction (PCR) profile of DNA extracted from 6 dams (A, B, C, D, E, and F) and the blood of their respective calves (a, b, c, d, e, and f). L — ladder DNA; N — blank (distilled water); J — positive-control DNA (from Japanese Theileria sergenti strain). B: Southern blot hybridization to verify that the PCR products in A are specific for T. sergenti; a T. sergenti probe labelled with radioactive phosphorus was used.