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Leishmaniases are neglected zoonoses transmitted by protozoan parasites belonging to the genus  Leishmania . Because of this, research is being developed to find new drugs, for effective treatment, making it necessary to use liquid culture media to promote the growth of promastigotes forms of  Leishmania . We sought to compare cell growth in an initial culture medium of 100% Schneideru0027s Insect to a final culture medium containing 100% RPMI 1640, to reduce the cost of research, since RPMI is more accessible. The parasites were first cultivated in 100% Schneideru0027s Insect medium, with a maximum number of 2.012x10⁸ cells/mL, which were transferred, with an appropriate methodology, to media with lower concentrations of Schneider, with a maximum number of 2.35x10⁷cells/mL for the lower concentration of Schneider. The 50%Schneider/50%RPMI concentration cells showed excellent cell motility and viability; however, in concentrations u003c50%Schneider, motility was compromised and, in 100%RPMI, the cells entered in the phase of decline.  With correct handling and constant repikes, the  Leishmania amazonensis  strains can adapt to the RPMI 1640 culture medium without much interference in its cellular viability, maintaining the morphological characteristics, even after exhaustive nutrient replacements and metabolites removal by centrifugation.

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Comparison of the growth of promastigotes cellular lineages of Leishmania amazonensis by the sequential adaptation of Schneider's insect for RPMI 1640 medium culture.