Abstract
Trypanosoma lewisi was cultivated as forms which appeared to be physiologically similar to those found in vivo. The medium consisted of 1.0 g peptone, 1.0 g glucose, 10 ml rat serum, 10,000 units penicillin G, 10,000 μg streptomycin and 90 ml Hank's Balanced Salt Solution. It was supplemented with 8.0 × 10 8 rat erythrocytes per milliliter. In the complete medium trypanosomes multiplied for 48–72 hr. Cultured forms were lethal to newborn rats and infective to adults. Adsorbed early immune serum inhibited the growth of the trypanosomes in vitro and the percentage of reproductives declined from 66 to 45%. The cultured trypanosomes were also susceptible to both trypanocidal antibodies.
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