Use of polymerase chain reaction in bovine babesiosis research.

The polymerase chain reaction (PCR) in babesiosis research was originally developed to detect Babesia bovis or Babesia bigemina in blood samples containing infected erythrocytes. These preliminary studies led to development of a sensitive PCR/DNA probe assay to detect the following hemoparasites: B. bigemina and B. bovis in a single sample. This modified procedure, referred to as a duplex PCR/ nonradioactive probe assay, has an analytic sensitivity of 0.00001% for B. bigemina, and 0.00001% infected erythrocytes for B. bovis. This procedure has been modified to detect Babesia DNA in tick tissue and hemolymph. The above procedures can be performed in central laboratories that have access to a thermocycler and quality reagents. Precautions must be observed to prevent cross-contamination of samples. At the present time the procedure has application in epidemiology studies to detect carriers and the species of Babesia in the bovine population. Preliminary studies are in progress by various research groups to utilize this technique in studying the biology of the Babesia protozoans in tick vectors. The applications, advantages, and disadvantages of the technique are presented.