Spatial and Temporal Trends in Insecticide Resistance among Malaria Vectors in Chad Highlight the Importance of Continual Monitoring
Publication Date
May 26, 2016
Journal
PLOS ONE
Authors
Geraldine Marie Foster, Michael Coleman, Edward Thomsen, Hilary Ranson, et al
Volume
11
Issue
5
Pages
e0155746
DOI
https://dx.plos.org/10.1371/journal.pone.0155746
Publisher URL
http://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0155746
Scopus
84973472634
Mendeley
http://www.mendeley.com/research/spatial-temporal-trends-insecticide-resistance-among-malaria-vectors-chad-highlight-importance-conti
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Mendeley | Further Information

{"title"=>"Spatial and temporal trends in insecticide resistance among malaria vectors in chad highlight the importance of continual monitoring", "type"=>"journal", "authors"=>[{"first_name"=>"Geraldine Marie", "last_name"=>"Foster", "scopus_author_id"=>"56725035000"}, {"first_name"=>"Michael", "last_name"=>"Coleman", "scopus_author_id"=>"57075674400"}, {"first_name"=>"Edward", "last_name"=>"Thomsen", "scopus_author_id"=>"36133799700"}, {"first_name"=>"Hilary", "last_name"=>"Ranson", "scopus_author_id"=>"6603762935"}, {"first_name"=>"Elise", "last_name"=>"Yangalb�-Kalnone", "scopus_author_id"=>"57201177677"}, {"first_name"=>"Tchomfienet", "last_name"=>"Moundai", "scopus_author_id"=>"57189625383"}, {"first_name"=>"Israel Demba", "last_name"=>"Kodindo", "scopus_author_id"=>"57189619091"}, {"first_name"=>"Amen", "last_name"=>"Nakebang", "scopus_author_id"=>"57189622685"}, {"first_name"=>"Adoum", "last_name"=>"Mahamat", "scopus_author_id"=>"55949222900"}, {"first_name"=>"Mallaye", "last_name"=>"Peka", "scopus_author_id"=>"25228042200"}, {"first_name"=>"Clement", "last_name"=>"Kerah-Hinzoumb�", "scopus_author_id"=>"57201179679"}], "year"=>2016, "source"=>"PLoS ONE", "identifiers"=>{"pmid"=>"27228026", "sgr"=>"84973472634", "doi"=>"10.1371/journal.pone.0155746", "scopus"=>"2-s2.0-84973472634", "pui"=>"610522996", "isbn"=>"1932-6203", "issn"=>"19326203"}, "id"=>"61411923-6cc0-3699-9fdc-7c4cad203532", "abstract"=>"<sec id=\"sec001\"> <title>Background</title> <p>A longitudinal <italic>Anopheles gambiae</italic> s.l. insecticide resistance monitoring programme was established in four sentinel sites in Chad 2008?2010. When this programme ended, only sporadic bioassays were performed in a small number of sites.</p> </sec> <sec id=\"sec002\"> <title>Methods</title> <p>WHO diagnostic dose assays were used to measure the prevalence of insecticide resistance to 0.1% bendiocarb, 4% DDT, 0.05% deltamethrin, 1% fenitrothion, and 0.75% permethrin in the main malaria vectors at the beginning and end of the malaria transmission season for three years 2008?2010, with subsequent collections in 2011 and 2014. Species and molecular identification of <italic>An</italic>. <italic>gambiae</italic> M and S forms and <italic>kdr</italic> genotyping was performed using PCR-RLFP; circumsporozoite status was assessed using ELISA.</p> </sec> <sec id=\"sec003\"> <title>Results</title> <p>Between 2008 and 2010, significant changes in insecticide resistance profiles to deltamethrin and permethrin were seen in 2 of the sites. No significant changes were seen in resistance to DDT in any site during the study period. Testing performed after the period of routine monitoring had ended showed dramatic increases to DDT and pyrethroid resistance in 3 sites. No resistance to organophosphate or carbamate insecticides was detected. <italic>An</italic>. <italic>arabiensis</italic> was the predominate member of the <italic>An</italic>. <italic>gambiae</italic> complex in all 4 sites; adult collections showed temporal variation in species composition in only 1 site. <italic>Kdr</italic> analysis identified both 1014F and 1014S alleles in <italic>An</italic>. <italic>gambiae</italic> S only. Circumsporozoite analysis showed the highest vector infection rates were present in Donia, a site with extensive use of agricultural insecticides.</p> </sec> <sec id=\"sec004\"> <title>Conclusions</title> <p>During the monitoring gap of four years, significant changes occurred in resistance prevalence in 3 of the 4 sites (p = &lt;0.001), endangering the efficacy of currently implemented malaria control interventions. Significant changes in insecticide resistance profiles and a lack of <italic>kdr</italic> resistance alleles in adult populations highlight the urgent need for comprehensive entomological monitoring to be implemented and sustained in country.</p> </sec>", "link"=>"http://www.mendeley.com/research/spatial-temporal-trends-insecticide-resistance-among-malaria-vectors-chad-highlight-importance-conti", "reader_count"=>19, "reader_count_by_academic_status"=>{"Researcher"=>3, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>5, "Student > Master"=>5, "Other"=>1, "Student > Bachelor"=>2, "Lecturer"=>1, "Lecturer > Senior Lecturer"=>1}, "reader_count_by_user_role"=>{"Researcher"=>3, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>5, "Student > Master"=>5, "Other"=>1, "Student > Bachelor"=>2, "Lecturer"=>1, "Lecturer > Senior Lecturer"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>1, "Environmental Science"=>1, "Biochemistry, Genetics and Molecular Biology"=>1, "Agricultural and Biological Sciences"=>7, "Medicine and Dentistry"=>2, "Veterinary Science and Veterinary Medicine"=>2, "Social Sciences"=>1, "Immunology and Microbiology"=>3, "Economics, Econometrics and Finance"=>1}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>2}, "Social Sciences"=>{"Social Sciences"=>1}, "Immunology and Microbiology"=>{"Immunology and Microbiology"=>3}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>7}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>1}, "Unspecified"=>{"Unspecified"=>1}, "Environmental Science"=>{"Environmental Science"=>1}, "Veterinary Science and Veterinary Medicine"=>{"Veterinary Science and Veterinary Medicine"=>2}}, "reader_count_by_country"=>{"United States"=>1}, "group_count"=>3}

Scopus | Further Information

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