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A Novel Assay for Simultaneous Assessment of Mammalian Host Blood, Mosquito Species, and Plasmodium spp. in the Medically Important Anopheles Mosquitoes of Madagascar

Riley E. TedrowThe Center for Global Health and Diseases, Case Western Reserve University, Cleveland, Ohio;
Department of Biology, Case Western Reserve University, Cleveland, Ohio;

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Jocelyn RatovonjatoDirection de Lutte contre le Paludisme/National Malaria Control Program Madagascar, Antananarivo, Madagascar;

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Edward D. WalkerDepartment of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan;

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Arsene C. RatsimbasoaDirection de Lutte contre le Paludisme/National Malaria Control Program Madagascar, Antananarivo, Madagascar;
Faculty of Medicine and Faculty of Sciences, University of Antananarivo, Antananarivo, Madagascar

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Peter A. ZimmermanThe Center for Global Health and Diseases, Case Western Reserve University, Cleveland, Ohio;
Department of Biology, Case Western Reserve University, Cleveland, Ohio;

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Anopheles mosquitoes vary in habitat preference, feeding pattern, and susceptibility to various measures of vector control. Consequently, it is important that we identify reservoirs of disease, identify vectors, and characterize feeding patterns to effectively implement targeted control measures. Using 467 anopheline mosquito abdomen squashes captured in Madagascar, we designed a novel ligase detection reaction and fluorescent microsphere assay, dubbed Bloodmeal Detection Assay for Regional Transmission (BLOODART), to query the bloodmeal content, identify five Anopheles mosquito species, and detect Plasmodium infection. Validation of mammalian bloodspots was achieved by preparation and analysis of known hosts (singular and mixed), sensitivity to degradation and storage method were assessed through mosquito feeding experiments, and quantification was explored by altering ratios of two mammal hosts. BLOODART identifications were validated by comparison with mosquito samples identified by sequenced portions of the internal transcribed spacer 2. BLOODART identification of control mammal bloodspots was 100% concordant for singular and mixed mammalian blood. BLOODART was able to detect hosts up to 42 hours after digestion when mosquito samples were stored in ethanol. A mammalian host was identified in every field-collected, blood-fed female Anopheles mosquito by BLOODART. The predominant mosquito host was cow (n = 451), followed by pig (n = 26) and human (n = 25). Mixed species bloodmeals were commonly observed (n = 33). A BLOODART molecular identification was successful for 318/467 mosquitoes, with an overall concordance of 60% with all field-captured, morphologically identified Anopheles specimens. BLOODART enables characterization of large samples and simultaneous pathogen detection to monitor and incriminate disease vectors in Madagascar.

Author Notes

Address correspondence to Peter A. Zimmerman, The Center for Global Health and Diseases, Case Western Reserve University, Biomedical Research Building 4th Floor, 10900 Euclid Ave. LC: 4983, Cleveland, OH 44106. E-mail: paz@case.edu

Financial support: Stipend support for R. E. T. was provided by the U.S. Navy Health Services Collegiate Program. Additional support was provided to P. A. Z. through the CWRU School of Medicine.

Ethics approval and consent to participate: These epidemiological surveys are routinely performed by the Madagascar NMCP and are consistent with protocols approved by the Madagascar Ministry of Health (No. 099-MSANP/CE). In addition, community and household approvals were obtained following fokontany-based meetings before initiating all study activities.

Authors’ addresses: Riley E. Tedrow and Peter A. Zimmerman, The Center for Global Health and Diseases, Case Western Reserve University, Cleveland, OH, E-mails: ret31@case.edu and paz@case.edu. Jocelyn Ratovonjato and Arsene Ratsimbasoa, Direction de Luttecontre le Paludisme/National Malaria Control Program Madagascar, Ministry of Health, Antananarivo, Madagascar, E-mails: njatovo_joc@yahoo.fr and aratsimbasoa@gmail.com. Edward D. Walker, Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI, E-mail: walker@msu.edu.

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