Concentration of Babesia bigemina-infected erythrocytes using a dextran sulphate affinity column

Babesia bigemina-infected erythrocytes preferentially bind to dextran sulphate affinity columns. Subsequent elution yields suspensions containing up to 95% infected erythrocytes. Preliminary immunoblotting studies indicate a parasite antigen of 35,000 mol. wt might be implicated in the binding.