Ehrlich tried methylene blue as an antidote for malaria and trypan red
against trypanosomes, marking his initial attempts at chemotherapy.
Modern chemotherapy got its start in the early part of this century, when the German bacteriologist Paul Ehrlich and his research team discovered that a dye called trypan red
could kill trypanosomes--parasites that cause sleeping sickness--and that a chemical he named salvarsan destroyed the spirochete microbe that leads to syphilis.
By 1907 he had located a dye called Trypan red
that combined with and killed trypanosomes, a type of protozoa that caused sleeping sickness.