HEMOPROTOZOAL CONTROL

DEMONSTRATION IN COLOMBIA AND POSSIBLY BRAZIL SPANS 3 YEARS AND PROVIDES FACTUAL EVALUATION OF ECONOMIC BENEFITS. DOCUMENTATION OF RESULTS IS DISSEMINATED. METHOD INVOLVES PREMUNITION, CONTROLLED INFECTION OF ANIMALS TO MAKE THEM CLINICALLY NORMAL IMMUNE CARRIERS. 80% OF ANIMALS 4-24 MO OLD ARE PREMUNIZED; 20% ARE CONTROL. WEIGHT, BLOOD EXAMINED PERIODICALLY TO DETERMINE EFFICACY OF IMMUNITY. AT 6-MO INTERVALS 2 CONTROL, 2 PREMUNIZED CALVES ARE INTENTIONALLY CHALLENGED WITH ANAPLASMA, BABESIA TO ESTABLISH DEGREE OF PROTECTION.