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Growth inhibition of the lower trypanosomatids Crithidia fasciculata and a Leptomonas from a hemipteron by several established trypanocides and leishmanicides were compared in four complex and one defined media. The Leptomonas was more susceptible than C. fasciculata in all media, especially to phenanthridines (ethidium, prothidium, isometamidium) and diamidines (pentamidine, diminazene diaceturate [Berenil], hydroxystilbamidine, stilbamidine); concentrations of these drugs required for 50% inhibition of the Leptomonas were &lt;5 mug/ml. In contrast, C. fasciculata was uninhibited by &lt;20 mug of diamidines per ml and was three- to sixfold less susceptible than the Leptomonas to isometamidium and prothidium. Both trypanosomatids were susceptible to nucleoside antibiotics, e.g., nucleocidin. Neither was inhibited by suramin, melarsen, melarsen oxide, or tryparsamide. The Leptomonas was more susceptible to standard trypanocides than five other insect trypanosomatids in a complex medium; it was the only one inhibited by &lt;20 mug of stilbamidine and hydroxystilbamidine per ml.

Susceptibility of an Insect Leptomonas and Crithidia fasciculata to Several Established Antitrypanosomatid Agents