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The in vitro Generation and Functional Analysis of Murine T Cell Populations and Clones Specific for a Protozoan Parasite, Leishmania tropica

Leishmanias are protozoan parasites capable of infecting man and several other mammalian species (Faust et al. 1974). They are transmitted by the bite of infected sandflies, which inoculate the microorganisms in their flagellate (promastigote) form. Upon injection into the skin of a host, promastigotes are engulfed by and take up residence in mononuclear phagocytes (the host cell), where they transform into aflagellate amastigotes. Parasitized macrophages are taken up when the insect feeds on an infected host; amastigotes then transform again into promastigotes in the alimentary tract ofthe vector. The promastigote form of the organism can easily be grown mv/7ro(Nicolle 1908, Bray & Bryceson 1969), in contrast to the amastigote forms which cannot be maintained extracellularly.