Ackerman S B, Seed J R
Experientia. 1976 May 15;32(5):645-7. doi: 10.1007/BF01990212.
Daily administration of tryptophol to laboratory rodents resulted in significantly depressed antibody production of heterologous red blood cell challenge, did not alter cellular-mediated responses to oxazalone. These results suggest that trypanosome-produced tryptophol may account for the immunodepression observed during trypanosomiasis.