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Am. J. Trop. Med. Hyg., 31(2), 1982, pp. 275-279
Copyright © 1982 by The American Society of Tropical Medicine and Hygiene

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Mansonella Ozzardi in Haiti

III. A Comparison of the Sensitivity of Four Sampling Methods in Detecting Infections*

Christian Raccurt, Robert C. Lowrie, Jr., Jacques Boncy AND Stephen P. Katz
Service de Microbiologie, Faculté de Médecine, Port-au-Prince, Haiti, W.I., and International Center for Medical Research, Tulane University, New Orleans, Louisiana, U.S.A.

A study to compare the sensitivity of four sampling methods in detecting Mansonella ozzardi among 133 inhabitants of Bayeux, Haiti, is reported. The Knott method proved the most sensitive with 40 microfilaria carriers detected. No additional infections were revealed by the other sampling methods. This was followed in order by 20 mm3 thick films of earlobe blood (34 cases), finger-prick blood (32 cases in the first sample), and skin biopsy (14 cases from paired samples). The combination of three finger-prick samples (60 mm3 of blood) detected 38 of 40 (95%) Knott-positive infections. The Knott method detected only one case not observed by at least one of the other three sampling methods. This sampling procedure did not detect more M. ozzardi in the 0-19-year age group than observed by the 20-mm3 finger prick method. Based on these results, a correction factor of 1.25 can be applied to our earlier Bayeux survey.

Accepted for publication June 22, 1981.


* This study was supported by the International Center for Medical Research Grant AI 10050, National Institute of Allergy and Infectious Diseases, NIH, by U.S.P.H.S. Grant RR 00164, Division of Research Resources, NIH, by the World Health Organization, and by the Cultural and Technical Mission of the French Embassy in Port-au-Prince, Haiti.

Address reprint requests to Dr. Robert C. Lowrie, Jr., Delta Regional Primate Research Center, Covington, LA 70433.






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Copyright © 1982 by the American Society of Tropical Medicine and Hygiene.