Differential growth requirements of several Leishmania spp. in chemically defined culture media

17 strains of Leishmania from 4 species: brasiliensis, mexicana, donovani and garnhami have been continually cultured at 26 degrees C, in the absence of proteins, in a medium containing salts, glucose, D-ribose, 2-deoxyribose, hemin, tricine, HEPES, 34 amino acids and intermediates of amino acid metabolism, 23 vitamins, 6 nucleotides and tetrahydrofolic acid. A wide variation in growth requirements was observed among leishmaniae which permitted the preparation of different minimum culture media for each Leishmania spp. Virulence of parasites was maintained after 30 passages in these chemically defined media. The requirements for differentiation to amastigotes also varied among the species as a function of the temperature of incubation and the protein content of the culture medium. Bovine serum albumin tryptic peptides substituted fetal bovine serum as growth factors at 30-34 degrees C.