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The Occurrence of Microfilaria Ozzardi in Panama¹

1. Microfilaria ozzardi was found in the blood of 44.5 per cent of 119 Indians examined in the Tuira River basin, Darien Province, Panama.

2. The infection rate in native villages in the same region varied from 2 to 57 per cent and averaged 9.9 per cent in the 244 natives examined.

3. A few cases of infection with M. ozzardi were found in the Chagres River valley, Panama, but all of these were recent arrivals from the Atrato River valley, Colombia.

4. No evidence was found that M. ozzardi is pathogenic or in any way a significant problem of public health importance.

5. Southeastern Panama is an endemic center of infection with M. ozzardi heretofore unknown in the geographical distribution of the parasite.

¹ This investigation was aided by a grant from the Rockefeller Foundation.

The writer is indebted to Dr. Herbert C. Clark, Director of the Gorgas Memorial Laboratory, for suggesting the investigation and for the use of the data from his two previous surveys.