Side Benefits of Mass Drug Administration for Lymphatic Filariasis on Strongyloides stercoralis Prevalence on Pemba Island, Tanzania

Beatrice Barda Department of Medical Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, Basel, Switzerland;
University of Basel, Basel, Switzerland;

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Marco Albonico Center for Tropical Diseases, Negrar Hospital, Verona, Italy;
Public Health Laboratory Ivo de Carneri, Chake-Chake, Tanzania

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Dora Buonfrate Center for Tropical Diseases, Negrar Hospital, Verona, Italy;

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Shaali M. Ame Public Health Laboratory Ivo de Carneri, Chake-Chake, Tanzania

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Said Ali Public Health Laboratory Ivo de Carneri, Chake-Chake, Tanzania

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Benjamin Speich Department of Medical Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, Basel, Switzerland;
University of Basel, Basel, Switzerland;

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Jennifer Keiser Department of Medical Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, Basel, Switzerland;
University of Basel, Basel, Switzerland;

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Strongyloides stercoralis, although endemic in many countries, is not included in helminth control programs. Few data are available on the prevalence and morbidity linked to this infection. We compared data from two studies conducted in 1998 and 2013 on Pemba Island, Tanzania, involving 525 and 509 schoolchildren, respectively. In 1998, the diagnostic method used was Harada Mori, whereas in 2013 diagnosis was made by both Koga agar plate and Baermann methods. The prevalence registered was 41% in 1998 and 7% in 2013. This data suggest that the prevalence of S. stercoralis on Pemba was significantly reduced 7 years after the last ivermectin administration for preventive chemotherapy and underlines the importance and impact of large-scale preventive chemotherapy, which often goes beyond its actual target. Preventive chemotherapy with ivermectin should be recommended in areas where S. stercoralis is endemic.

Author Notes

Address correspondence to Beatric Barda, Department of Medical Parasitology and Infection Biology, Swiss Tropical and Public, Health Institute, P.O. Box, CH-4002 Basel, Switzerland. E-mail: beatrice.barda@unibas.ch

Financial support: Jennifer Keiser is thankful to the European Research Council (ERC-2013-CoG 614739-A_HERO) for financial support.

Authors’ addresses: Beatrice Barda, Department of Medical Parasitology and Infection Biology, Schweizerisches Tropen- und Public Health-Institut, Basel, Switzerland, E-mail: beatrice.barda@unibas.ch. Marco Albonico and Dora Buonfrate, Centre for Tropical Diseases, Sacro Cuore-Don Calabria Hospital, Verona, Italy, E-mails: albonico@tin.it and dora.buonfrate@sacrocuore.it. Ame Shaali Makame, Department of Microbiology, Public Health Laboratory Ivo de Carneri, Chake-Chake, Tanzania, E-mail: shaaliame@yahoo.com. Said M. Ali, Public Health Laboratory Ivo de Carneri, Zanzibar, Tanzania, E-mail: saidmali2003@yahoo.com. Benjamin Speich, Department of Clinical Research, Basel Institute for Clinical Epidemiology and Biostatistics, Universitatsspital Basel, Basel, Switzerland, E-mail: beni.speich@gmail.com. Jennifer Keiser, Department of Medical Parasitology and Infection Biology, Swiss Tropical Institute, Basel, Switzerland, E-mail: jennifer.keiser@unibas.ch.

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