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Microfilariae were observed in 25 of 187 blood leucocyte-culture preparations made for chromosome studies on 28 Piaroa and 159 Yanomama Indians living near the Brazilian border of Amazonas, Venezuela. Among the Yanomama, 17 (10.7%) were infected, all with Mansonella ozzardi. Among the Piaroa, 8 (28.6%) were infected3 with M. ozzardi, 4 with Dipetalonema perstans, and 1 with both species.
Accepted for publication September 6, 1975.
* Supported by the Energy Research and Development Administration and the National Science Foundation, and by grants no. AI04919 and AI10050 from the National Institutes of Health.
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