Collapse of Anopheles darlingi Populations in Suriname After Introduction of Insecticide-Treated Nets (ITNs); Malaria Down to Near Elimination Level

Hélène Hiwat Laboratory of Entomology, Wageningen University and Research Centre, Wageningen, The Netherlands; Ministry of Health Malaria Program, Bureau of Public Health, Paramaribo, Suriname; Entomology Department, Bureau of Public Health, Paramaribo, Suriname

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Sutrisno Mitro Laboratory of Entomology, Wageningen University and Research Centre, Wageningen, The Netherlands; Ministry of Health Malaria Program, Bureau of Public Health, Paramaribo, Suriname; Entomology Department, Bureau of Public Health, Paramaribo, Suriname

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Ashok Samjhawan Laboratory of Entomology, Wageningen University and Research Centre, Wageningen, The Netherlands; Ministry of Health Malaria Program, Bureau of Public Health, Paramaribo, Suriname; Entomology Department, Bureau of Public Health, Paramaribo, Suriname

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Prem Sardjoe Laboratory of Entomology, Wageningen University and Research Centre, Wageningen, The Netherlands; Ministry of Health Malaria Program, Bureau of Public Health, Paramaribo, Suriname; Entomology Department, Bureau of Public Health, Paramaribo, Suriname

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Treyanti Soekhoe Laboratory of Entomology, Wageningen University and Research Centre, Wageningen, The Netherlands; Ministry of Health Malaria Program, Bureau of Public Health, Paramaribo, Suriname; Entomology Department, Bureau of Public Health, Paramaribo, Suriname

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Willem Takken Laboratory of Entomology, Wageningen University and Research Centre, Wageningen, The Netherlands; Ministry of Health Malaria Program, Bureau of Public Health, Paramaribo, Suriname; Entomology Department, Bureau of Public Health, Paramaribo, Suriname

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A longitudinal study of malaria vectors was carried out in three villages in Suriname between 2006 and 2010. During 13,392 man hours of collections, 3,180 mosquitoes were collected, of which 33.7% were anophelines. Of these, Anopheles darlingi accounted for 88.1%, and An. nuneztovari accounted for 11.1%. The highest mean An. darlingi human biting rate (HBR) observed per survey was 1.43 bites/man per hour outdoor and 1.09 bites/man per hour indoor; 2 An. darlingi of the 683 tested were infected with Plasmodium falciparum. The anopheline HBR decreased to zero after the onset of malaria intervention activities, including insecticide-treated net (ITN) distribution, in 2006. Malaria transmission decreased to pre-elimination levels. It is concluded that the combination of ITN and climatic events has led to the collapse of malaria vector populations in the study sites in the interior of the country. The results are discussed in relation to the stability of malaria transmission in areas with low-density human populations.

Author Notes

*Address correspondence to Hélène Hiwat, Ministry of Health Malaria Program Suriname, c/o Bureau of Public Health, Rode Kruislaan 22, Paramaribo, Suriname. E-mail: helenehiwat@gmail.com

Financial support: The entomological monitoring of malaria vectors in Suriname was part of the Medical Mission Malaria Program, which was supported by the Global Fund to Fight AIDS, Tuberculosis, and Malaria (Grant SUR-404-G02-M).

Authors' addresses: Hélène Hiwat, Laboratory of Entomology, Wageningen University and Research Centre, Wageningen, The Netherlands and Ministry of Health Malaria Program Suriname, Bureau of Public Health, Paramaribo, Suriname, E-mail: helenehiwat@gmail.com. Sutrisno Mitro, Ashok Samjhawan, Prem Sardjoe, and Treyanti Soekhoe, Entomology Department, Bureau of Public Health, Paramaribo, Suriname, E-mails: jackymitro@hotmail.com, rokasasur@hotmail.com, premsardjoe@yahoo.com, and treyantis@hotmail.com. Willem Takken, Laboratory of Entomology, Wageningen University and Research Centre, Wageningen, The Netherlands, E-mail: Willem.Takken@wur.nl.

Reprint requests: Hélène Hiwat, Ministry of Health Malaria Program Suriname, c/o Bureau of Public Health, Rode Kruislaan 22, Paramaribo, Suriname, E-mail: helenehiwat@gmail.com.

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