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Fine scale spatiotemporal clustering of dengue virus transmission in children and aedes aegypti in rural Thai villages
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نویسنده
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yoon i.-k. ,getis a. ,aldstadt j. ,rothman a.l. ,tannitisupawong d. ,koenraadt c.j.m. ,fansiri t. ,jones j.w. ,morrison a.c. ,jarman r.g. ,nisalak a. ,mammen jr. m.p. ,thammapalo s. ,srikiatkhachorn a. ,green s. ,libraty d.h. ,gibbons r.v. ,endy t. ,pimgate c. ,scott t.w.
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منبع
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plos neglected tropical diseases - 2012 - دوره : 6 - شماره : 7
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چکیده
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Background: based on spatiotemporal clustering of human dengue virus (denv) infections,transmission is thought to occur at fine spatiotemporal scales by horizontal transfer of virus between humans and mosquito vectors. to define the dimensions of local transmission and quantify the factors that support it,we examined relationships between infected humans and aedes aegypti in thai villages. methodology/principal findings: geographic cluster investigations of 100-meter radius were conducted around denv-positive and denv-negative febrile index cases (positive and negative clusters,respectively) from a longitudinal cohort study in rural thailand. child contacts and ae. aegypti from cluster houses were assessed for denv infection. spatiotemporal,demographic,and entomological parameters were evaluated. in positive clusters,the denv infection rate among child contacts was 35.3% in index houses,29.9% in houses within 20 meters,and decreased with distance from the index house to 6.2% in houses 80-100 meters away (p<0.001). significantly more ae. aegypti were denv-infectious (i.e.,denv-positive in head/thorax) in positive clusters (23/1755; 1.3%) than negative clusters (1/1548; 0.1%). in positive clusters,8.2% of mosquitoes were denv-infectious in index houses,4.2% in other houses with denv-infected children,and 0.4% in houses without infected children (p<0.001). the denv infection rate in contacts was 47.4% in houses with infectious mosquitoes,28.7% in other houses in the same cluster,and 10.8% in positive clusters without infectious mosquitoes (p<0.001). ae. aegypti pupae and adult females were more numerous only in houses containing infectious mosquitoes. conclusions/significance: human and mosquito infections are positively associated at the level of individual houses and neighboring residences. certain houses with high transmission risk contribute disproportionately to denv spread to neighboring houses. small groups of houses with elevated transmission risk are consistent with over-dispersion of transmission (i.e.,at a given point in time,people/mosquitoes from a small portion of houses are responsible for the majority of transmission).
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آدرس
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department of virology,armed forces research institute of medical sciences,bangkok, Thailand, department of geography,san diego state university,san diego,ca, United States, department of geography,university at buffalo,buffalo,ny, United States, institute for immunology and informatics,university of rhode island,providence,ri, United States, department of virology,armed forces research institute of medical sciences,bangkok, Thailand, laboratory of entomology,wageningen university,wageningen, Netherlands, department of entomology,armed forces research institute of medical sciences,bangkok, Thailand, department of entomology,armed forces research institute of medical sciences,bangkok, Thailand, department of entomology,university of california davis,davis,ca, United States, department of virology,armed forces research institute of medical sciences,bangkok, Thailand, department of virology,armed forces research institute of medical sciences,bangkok, Thailand, department of virology,armed forces research institute of medical sciences,bangkok, Thailand, bureau of vector-borne disease,department of disease control,thailand ministry of public health,nonthaburi, Thailand, division of infectious diseases and immunology,department of medicine,university of massachusetts medical school,worcester,ma, United States, division of infectious diseases and immunology,department of medicine,university of massachusetts medical school,worcester,ma, United States, division of infectious diseases and immunology,department of medicine,university of massachusetts medical school,worcester,ma, United States, department of virology,armed forces research institute of medical sciences,bangkok, Thailand, department of infectious diseases,state university of new york at syracuse,syracuse,ny, United States, department of virology,armed forces research institute of medical sciences,bangkok, Thailand, department of entomology,university of california davis,davis,ca,united states,fogarty international center,national institutes of health,bethesda,md, United States
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Authors
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