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Artemisinin-based combination therapy does not measurably reduce human infectiousness to vectors in a setting of intense malaria transmission

Artemisinin-based combination therapy (ACT) for treating malaria has activity against immature gametocytes. In theory, this property may complement the effect of terminating otherwise lengthy malaria infections and reducing the parasite reservoir in the human population that can infect vector mosqui...

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Published in:Malaria journal 2012-04, Vol.11 (1), p.118-118, Article 118
Main Authors: Huho, Bernadette J, Killeen, Gerard F, Ferguson, Heather M, Tami, Adriana, Lengeler, Christian, Charlwood, J Derek, Kihonda, Aniset, Kihonda, Japhet, Kachur, S Patrick, Smith, Thomas A, Abdulla, Salim Mk
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cites cdi_FETCH-LOGICAL-b650t-c0e2cdf74b0aa2c62068721b6d4db6356e0b46223137f8ef364ffa2efcde57e63
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container_title Malaria journal
container_volume 11
creator Huho, Bernadette J
Killeen, Gerard F
Ferguson, Heather M
Tami, Adriana
Lengeler, Christian
Charlwood, J Derek
Kihonda, Aniset
Kihonda, Japhet
Kachur, S Patrick
Smith, Thomas A
Abdulla, Salim Mk
description Artemisinin-based combination therapy (ACT) for treating malaria has activity against immature gametocytes. In theory, this property may complement the effect of terminating otherwise lengthy malaria infections and reducing the parasite reservoir in the human population that can infect vector mosquitoes. However, this has never been verified at a population level in a setting with intense transmission, where chronically infectious asymptomatic carriers are common and cured patients are rapidly and repeatedly re-infected. From 2001 to 2004, malaria vector densities were monitored using light traps in three Tanzanian districts. Mosquitoes were dissected to determine parous and oocyst rates. Plasmodium falciparum sporozoite rates were determined by ELISA. Sulphadoxine-pyrimethamine (SP) monotherapy was used for treatment of uncomplicated malaria in the contiguous districts of Kilombero and Ulanga throughout this period. In Rufiji district, the standard drug was changed to artesunate co-administered with SP (AS + SP) in March 2003. The effects of this change in case management on malaria parasite infection in the vectors were analysed. Plasmodium falciparum entomological inoculation rates exceeded 300 infective bites per person per year at both sites over the whole period. The introduction of AS + SP in Rufiji was associated with increased oocyst prevalence (OR [95%CI] = 3.9 [2.9-5.3], p 
doi_str_mv 10.1186/1475-2875-11-118
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In theory, this property may complement the effect of terminating otherwise lengthy malaria infections and reducing the parasite reservoir in the human population that can infect vector mosquitoes. However, this has never been verified at a population level in a setting with intense transmission, where chronically infectious asymptomatic carriers are common and cured patients are rapidly and repeatedly re-infected. From 2001 to 2004, malaria vector densities were monitored using light traps in three Tanzanian districts. Mosquitoes were dissected to determine parous and oocyst rates. Plasmodium falciparum sporozoite rates were determined by ELISA. Sulphadoxine-pyrimethamine (SP) monotherapy was used for treatment of uncomplicated malaria in the contiguous districts of Kilombero and Ulanga throughout this period. In Rufiji district, the standard drug was changed to artesunate co-administered with SP (AS + SP) in March 2003. The effects of this change in case management on malaria parasite infection in the vectors were analysed. Plasmodium falciparum entomological inoculation rates exceeded 300 infective bites per person per year at both sites over the whole period. The introduction of AS + SP in Rufiji was associated with increased oocyst prevalence (OR [95%CI] = 3.9 [2.9-5.3], p &lt; 0.001), but had no consistent effect on sporozoite prevalence (OR [95%CI] = 0.9 [0.7-1.2], p = 0.5). The estimated infectiousness of the human population in Rufiji was very low prior to the change in drug policy. Emergence rates and parous rates of the vectors varied substantially throughout the study period, which affected estimates of infectiousness. The latter consequently cannot be explained by the change in drug policy. In high perennial transmission settings, only a small proportion of infections in humans are symptomatic or treated, so case management with ACT may have little impact on overall infectiousness of the human population. Variations in infection levels in vectors largely depend on the age distribution of the mosquito population. Benefits of ACT in suppressing transmission are more likely to be evident where transmission is already low or effective vector control is widely implemented.</description><identifier>ISSN: 1475-2875</identifier><identifier>EISSN: 1475-2875</identifier><identifier>DOI: 10.1186/1475-2875-11-118</identifier><identifier>PMID: 22513162</identifier><language>eng</language><publisher>England: BioMed Central Ltd</publisher><subject><![CDATA[Animals ; Antigens, Protozoan - analysis ; Antimalarials ; Antimalarials - administration & dosage ; Artemisinin-based combination therapy ; Artemisinins - administration & dosage ; Asymptomatic Diseases - epidemiology ; Biomedical research ; Busta Rhymes ; Case management ; Child, Preschool ; Colleges & universities ; Control ; Culicidae - parasitology ; Disease control ; Disease prevention ; Disease transmission ; Disease Vectors ; Distribution ; Drug Combinations ; Drug therapy ; Enzyme-Linked Immunosorbent Assay ; Female ; Health aspects ; Health sciences ; Humans ; Infant ; Infant, Newborn ; Infection ; Intervention ; Malaria ; Malaria, Falciparum - drug therapy ; Malaria, Falciparum - epidemiology ; Malaria, Falciparum - transmission ; Mortality ; Mosquitoes ; Parasites ; Parasitic diseases ; Plasmodium falciparum ; Plasmodium falciparum - isolation & purification ; Pregnancy ; Prevalence ; Pyrimethamine - administration & dosage ; Risk factors ; Sulfadoxine - administration & dosage ; Tanzania - epidemiology ; Transmission reduction]]></subject><ispartof>Malaria journal, 2012-04, Vol.11 (1), p.118-118, Article 118</ispartof><rights>COPYRIGHT 2012 BioMed Central Ltd.</rights><rights>2012 Huho et al; licensee BioMed Central Ltd. 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In theory, this property may complement the effect of terminating otherwise lengthy malaria infections and reducing the parasite reservoir in the human population that can infect vector mosquitoes. However, this has never been verified at a population level in a setting with intense transmission, where chronically infectious asymptomatic carriers are common and cured patients are rapidly and repeatedly re-infected. From 2001 to 2004, malaria vector densities were monitored using light traps in three Tanzanian districts. Mosquitoes were dissected to determine parous and oocyst rates. Plasmodium falciparum sporozoite rates were determined by ELISA. Sulphadoxine-pyrimethamine (SP) monotherapy was used for treatment of uncomplicated malaria in the contiguous districts of Kilombero and Ulanga throughout this period. In Rufiji district, the standard drug was changed to artesunate co-administered with SP (AS + SP) in March 2003. 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Benefits of ACT in suppressing transmission are more likely to be evident where transmission is already low or effective vector control is widely implemented.</description><subject>Animals</subject><subject>Antigens, Protozoan - analysis</subject><subject>Antimalarials</subject><subject>Antimalarials - administration &amp; dosage</subject><subject>Artemisinin-based combination therapy</subject><subject>Artemisinins - administration &amp; dosage</subject><subject>Asymptomatic Diseases - epidemiology</subject><subject>Biomedical research</subject><subject>Busta Rhymes</subject><subject>Case management</subject><subject>Child, Preschool</subject><subject>Colleges &amp; universities</subject><subject>Control</subject><subject>Culicidae - parasitology</subject><subject>Disease control</subject><subject>Disease prevention</subject><subject>Disease transmission</subject><subject>Disease Vectors</subject><subject>Distribution</subject><subject>Drug Combinations</subject><subject>Drug therapy</subject><subject>Enzyme-Linked Immunosorbent Assay</subject><subject>Female</subject><subject>Health aspects</subject><subject>Health sciences</subject><subject>Humans</subject><subject>Infant</subject><subject>Infant, Newborn</subject><subject>Infection</subject><subject>Intervention</subject><subject>Malaria</subject><subject>Malaria, Falciparum - drug therapy</subject><subject>Malaria, Falciparum - epidemiology</subject><subject>Malaria, Falciparum - transmission</subject><subject>Mortality</subject><subject>Mosquitoes</subject><subject>Parasites</subject><subject>Parasitic diseases</subject><subject>Plasmodium falciparum</subject><subject>Plasmodium falciparum - isolation &amp; purification</subject><subject>Pregnancy</subject><subject>Prevalence</subject><subject>Pyrimethamine - administration &amp; dosage</subject><subject>Risk factors</subject><subject>Sulfadoxine - administration &amp; dosage</subject><subject>Tanzania - epidemiology</subject><subject>Transmission reduction</subject><issn>1475-2875</issn><issn>1475-2875</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><sourceid>PIMPY</sourceid><sourceid>DOA</sourceid><recordid>eNqFUk1v1DAQjRCIlsKdE7LEhcuW-Du9IFUrPipV4gJny7HHu14l9mInlfoj-p-ZZcvSRUXIVhzPvHmemTdN85q255R26j0VWi5Yhx9KcXdPmtOD6emD_5PmRa2btqW60-x5c8KYpJwqdtrcXZYJxlhjimnR2wqeuDz2Mdkp5kSmNRS7vSU-QyUpT2QEW-di--GWFPCzA7KeR5tITAEchsw1Qa1kyuQG77lU9BBLKkxTTCuSA94nSBXIaAdboiVTsaliBhXfe9k8C3ao8Or-PGu-f_r4bfllcf3189Xy8nrRK9lOC9cCcz5o0bfWMqdYq7Au2isvfK-4VND2QjHGKdehg8CVCMEyCM6D1KD4WXO15_XZbsy2xNGWW5NtNL8MuayMLVN0AxitufS-A-eZEFrpi1b3ggkptRChawNyfdhzbed-BO8gYUXDEemxJ8W1WeUbw0XHGa6zZrkn6GP-B8GxBwUyO2nNTlpDKe4OWd7dp1HyjxnqZLCnDobBJkBVDOotFRNc6f9DKUN2IQRH6Nu_oJs8l4TaIIpKKZiS8g9qZbFjOAoZ83Q7UnMpuWD8ouO7Z88fQeHyOIAuJwgR7UcB7T7AlVxrgXDoCW13NavHuvDmoRiHgN8Dz38C2xsCGQ</recordid><startdate>20120418</startdate><enddate>20120418</enddate><creator>Huho, Bernadette J</creator><creator>Killeen, Gerard F</creator><creator>Ferguson, Heather M</creator><creator>Tami, Adriana</creator><creator>Lengeler, Christian</creator><creator>Charlwood, J Derek</creator><creator>Kihonda, Aniset</creator><creator>Kihonda, Japhet</creator><creator>Kachur, S Patrick</creator><creator>Smith, Thomas A</creator><creator>Abdulla, Salim Mk</creator><general>BioMed Central Ltd</general><general>BioMed Central</general><general>BMC</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7SS</scope><scope>7U9</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8C1</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>H94</scope><scope>H95</scope><scope>H97</scope><scope>K9.</scope><scope>L.G</scope><scope>M0S</scope><scope>M1P</scope><scope>M7N</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>7X8</scope><scope>5PM</scope><scope>DOA</scope></search><sort><creationdate>20120418</creationdate><title>Artemisinin-based combination therapy does not measurably reduce human infectiousness to vectors in a setting of intense malaria transmission</title><author>Huho, Bernadette J ; Killeen, Gerard F ; Ferguson, Heather M ; Tami, Adriana ; Lengeler, Christian ; Charlwood, J Derek ; Kihonda, Aniset ; Kihonda, Japhet ; Kachur, S Patrick ; Smith, Thomas A ; Abdulla, Salim Mk</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-b650t-c0e2cdf74b0aa2c62068721b6d4db6356e0b46223137f8ef364ffa2efcde57e63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Animals</topic><topic>Antigens, Protozoan - analysis</topic><topic>Antimalarials</topic><topic>Antimalarials - administration &amp; dosage</topic><topic>Artemisinin-based combination therapy</topic><topic>Artemisinins - administration &amp; dosage</topic><topic>Asymptomatic Diseases - epidemiology</topic><topic>Biomedical research</topic><topic>Busta Rhymes</topic><topic>Case management</topic><topic>Child, Preschool</topic><topic>Colleges &amp; universities</topic><topic>Control</topic><topic>Culicidae - parasitology</topic><topic>Disease control</topic><topic>Disease prevention</topic><topic>Disease transmission</topic><topic>Disease Vectors</topic><topic>Distribution</topic><topic>Drug Combinations</topic><topic>Drug therapy</topic><topic>Enzyme-Linked Immunosorbent Assay</topic><topic>Female</topic><topic>Health aspects</topic><topic>Health sciences</topic><topic>Humans</topic><topic>Infant</topic><topic>Infant, Newborn</topic><topic>Infection</topic><topic>Intervention</topic><topic>Malaria</topic><topic>Malaria, Falciparum - drug therapy</topic><topic>Malaria, Falciparum - epidemiology</topic><topic>Malaria, Falciparum - transmission</topic><topic>Mortality</topic><topic>Mosquitoes</topic><topic>Parasites</topic><topic>Parasitic diseases</topic><topic>Plasmodium falciparum</topic><topic>Plasmodium falciparum - isolation &amp; 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In theory, this property may complement the effect of terminating otherwise lengthy malaria infections and reducing the parasite reservoir in the human population that can infect vector mosquitoes. However, this has never been verified at a population level in a setting with intense transmission, where chronically infectious asymptomatic carriers are common and cured patients are rapidly and repeatedly re-infected. From 2001 to 2004, malaria vector densities were monitored using light traps in three Tanzanian districts. Mosquitoes were dissected to determine parous and oocyst rates. Plasmodium falciparum sporozoite rates were determined by ELISA. Sulphadoxine-pyrimethamine (SP) monotherapy was used for treatment of uncomplicated malaria in the contiguous districts of Kilombero and Ulanga throughout this period. In Rufiji district, the standard drug was changed to artesunate co-administered with SP (AS + SP) in March 2003. The effects of this change in case management on malaria parasite infection in the vectors were analysed. Plasmodium falciparum entomological inoculation rates exceeded 300 infective bites per person per year at both sites over the whole period. The introduction of AS + SP in Rufiji was associated with increased oocyst prevalence (OR [95%CI] = 3.9 [2.9-5.3], p &lt; 0.001), but had no consistent effect on sporozoite prevalence (OR [95%CI] = 0.9 [0.7-1.2], p = 0.5). The estimated infectiousness of the human population in Rufiji was very low prior to the change in drug policy. Emergence rates and parous rates of the vectors varied substantially throughout the study period, which affected estimates of infectiousness. The latter consequently cannot be explained by the change in drug policy. In high perennial transmission settings, only a small proportion of infections in humans are symptomatic or treated, so case management with ACT may have little impact on overall infectiousness of the human population. Variations in infection levels in vectors largely depend on the age distribution of the mosquito population. Benefits of ACT in suppressing transmission are more likely to be evident where transmission is already low or effective vector control is widely implemented.</abstract><cop>England</cop><pub>BioMed Central Ltd</pub><pmid>22513162</pmid><doi>10.1186/1475-2875-11-118</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record>
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subjects Animals
Antigens, Protozoan - analysis
Antimalarials
Antimalarials - administration & dosage
Artemisinin-based combination therapy
Artemisinins - administration & dosage
Asymptomatic Diseases - epidemiology
Biomedical research
Busta Rhymes
Case management
Child, Preschool
Colleges & universities
Control
Culicidae - parasitology
Disease control
Disease prevention
Disease transmission
Disease Vectors
Distribution
Drug Combinations
Drug therapy
Enzyme-Linked Immunosorbent Assay
Female
Health aspects
Health sciences
Humans
Infant
Infant, Newborn
Infection
Intervention
Malaria
Malaria, Falciparum - drug therapy
Malaria, Falciparum - epidemiology
Malaria, Falciparum - transmission
Mortality
Mosquitoes
Parasites
Parasitic diseases
Plasmodium falciparum
Plasmodium falciparum - isolation & purification
Pregnancy
Prevalence
Pyrimethamine - administration & dosage
Risk factors
Sulfadoxine - administration & dosage
Tanzania - epidemiology
Transmission reduction
title Artemisinin-based combination therapy does not measurably reduce human infectiousness to vectors in a setting of intense malaria transmission
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