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We studied effects of combined diethylcarbamazine (DEC) and albendazole (ALB) treatment on Wuchereria bancrofti microfilaria (MF) uptake and development of infective larvae (L3) in Culex pipiens. Consenting Egyptian adults with microfilaremia (MF > 300/mL) were treated with one or seven daily doses of DEC/ALB. Laboratory-reared mosquitoes were fed on subjects before and after treatment. MF uptake and infectivity (assessed by mosquito dissection) were reduced by 89.6% and 82.9%, respectively, 12 months after single-dose treatment and by 96.2% and 99.7%, respectively, after multi-dose treatment. The L3:mosquito ratio decreased by 88% to 0.082 after single-dose treatment and by 99.8% to 0.001 after multi-dose treatment. If high coverage rates can be achieved for several annual cycles, mass drug administration (MDA) with DEC/ALB has the potential to decrease transmission to unsustainable levels and eliminate filariasis in populations. Multi-dose MDA (especially in the first year) might interrupt transmission with fewer cycles than single-dose treatment.
Received July 28, 2004. Accepted for publication December 29, 2004.
Acknowledgments: We are grateful for technical assistance provided by the field research teams and laboratory staff at the Research and Training Center on Vectors of Diseases at Ain Shams University.
Financial support: This work was supported by National Institutes of Health grant AI-35855.
* Address correspondence to Gary J. Weil, Infectious Diseases Division, Washington University School of Medicine, Box 8051, 660 S. Euclid Ave., St. Louis, MO 63110. E-mail: gweil{at}im.wustl.edu
Authors addresses: Hoda A. Farid, Ragaa E. Hammad, Marah M. Hassan, and Reda M. R. Ramzy, Research and Training Center on Vectors of Diseases, Faculty of Science Building, Ain Shams University, Abbassia, Cairo 11566, Egypt, Telephone and Fax, 20-2-683-9622; Maged El Setouhy, Faculty of Medicine, Ain Shams University, Abbassia, Cairo, Egypt. Telephone and Fax, 20-2-683-9622; Gary J. Weil, Infectious Diseases Division, Box 8051, Washington University School of Medicine, 660 S. Euclid Avenue, St. Louis, MO 63110, Telephone: 314-454-7782, Fax 314-454-5293, E-mail: gweil{at}im.wustl.edu.
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