AJTMH Transactions of the Royal Society of Tropical Medicine and Hygiene
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Am. J. Trop. Med. Hyg., 25(2), 1976, pp. 257-262
Copyright © 1976 by The American Society of Tropical Medicine and Hygiene

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Bancroftian Filariasis and Membrane Filters: Are Night Surveys Necessary?*

David T. Dennis{dagger}, Ellicott McConnell{ddagger} AND Graham B. White§
United States Naval Medical Research Unit Number 5, and the Institute of Pathobiology, National University, Addis Ababa, Ethiopia

Paired day and night blood specimens from 41 persons living in a hyperendemic Wuchereria bancrofti area of southwestern Ethiopia were examined for microfilariae by Nuclepore® filter, thick film, and counting chamber techniques. Filtering techniques were so highly sensitive that more infected persons were identified by filtering day blood than by examining night blood by conventional methods. Increasing the volume of blood filtered from 1 ml to 5 ml increased the number of positives identified during the day. Filtering 5 ml of day blood obviated the need for examining night blood, even though a high proportion of infected persons had very low numbers of circulating microfilariae.

Accepted for publication August 2, 1975.


* The opinions and assertions in this scientific report are those of the authors and do not necessarily reflect the official views of the Navy Department or the naval service at large. This work was supported by the U.S. Navy, Bureau of Medicine and Surgery Work Unit No. MF51.524.009-3020BF61.

Reprint requests should be directed to: Commanding Officer, NAMRU-5, Ethiopia, A.P.O. New York 09319.


{dagger} Present address: NAMRU-2, Djakarta Detachment, A.P.O. San Francisco 96356.


{ddagger} NAMRU-5, Ethiopia, A.P.O. New York 09319.


§ Present address: Department of Entomology, British Museum (Natural History), London SW7 5BD, England.






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Copyright © 1976 by the American Society of Tropical Medicine and Hygiene.