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In the Andean town of Paute, Ecuador, 2 of 97 (2%) Lutzomyia ayacuchensis Cáceres and Bianchi were found to be naturally infected with Leishmania promastigotes. The parasites were confined to the midgut of the sand fly, indicating they did not belong to the subgenus Leishmania (Viannia).
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Takaoka et al. (1990) studied this question.
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