Anemia with positive direct Coombs' test induced by trypan blue.

as evidence of autoimmune phenomena. The experimental production of positive antiglobulin tests by drugs and chemical agents, however, has suggested that nonimmunologic mechanisms may also be responsible for protein coating of erythrocytes.2’3 During attempts to produce tumors of the reticuloendothelial system in rats by injection of trypan blue, an anemia, chacacterized by increased ervthrocyte destruction and a positive Coombs’ test, was noted