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TRYPANOSOMA BRUCEI GAMBIENSE TRYPANOSOMIASIS IN TEREGO COUNTY, NORTHERN UGANDA, 1996: A LOT QUALITY ASSURANCE SAMPLING SURVEY

We estimated the pre-intervention prevalence of Trypanosoma brucei gambiense (Tbg) trypanosomiasis using the lot quality assurance sampling (LQAS) methods in 14 parishes of Terego County in northern Uganda. A total of 826 participants were included in the survey sample in 1996. The prevalence of laboratory confirmed Tbg trypanosomiasis adjusted for parish population sizes was 2.2% (95% confidence interval =1.1–3.2). This estimate was consistent with the 1.1% period prevalence calculated on the basis of cases identified through passive and active screening in 1996–1999. Ranking of parishes in four categories according to LQAS analysis of the 1996 survey predicted the prevalences observed during the first round of active screening in the population in 1997–1998 (P < 0.0001, by chi-square test). Overall prevalence and ranking of parishes obtained with LQAS were validated by the results of the population screening, suggesting that these survey methods may be useful in the pre-intervention phase of sleeping sickness control programs.

Received February 19, 2003. Accepted for publication August 14, 2003.

Acknowledgments: We are grateful to Dr. Mark White for suggestions on the survey methods and to Dr. Anne Moore for suggestions on the manuscript.

Financial support: This study was supported by Médecins Sans Frontières and by a grant from the European Development Fund EU/ EDF/DG8.

Authors’ addresses: Yvan J. F. Hutin and Dominique Legros, Epicentre Office in Uganda, PO Box 2362, Kampala, Uganda. Vincent Owini, Masters in Public Health Program, Makerere University, Kampala, Uganda. Vincent Brown and Christophe Paquet, Epicentre 8, Rue Saint Sabin, F-75 011 Paris, France, Telephone: 33-1-40-21-28-48, Fax: 33-1-40-21-03-28, E-mail: vbrown{at}epicentre.msf.org. Evan Lee, Médecins Sans Frontières Uganda, PO box 2362, Kampala, Uganda. Dawson Mbulamberi, National Sleeping Sickness Control Program, Entebbe, Uganda.

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