Conditions of malaria transmission in Dakar from 2007 to 2010
<p>Abstract</p> <p>Background</p> <p>Previous studies in Dakar have highlighted the spatial and temporal heterogeneity of <it>Anopheles gambiae s.l</it>. biting rates. In order to improve the knowledge of the determinants of malaria transmission in this city...
Main Authors: | , , , , , , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
BMC
2011-10-01
|
Series: | Malaria Journal |
Subjects: | |
Online Access: | http://www.malariajournal.com/content/10/1/312 |
id |
doaj-a8b2eb6befd6466cb1966b050648d921 |
---|---|
record_format |
Article |
spelling |
doaj-a8b2eb6befd6466cb1966b050648d9212020-11-25T01:40:59ZengBMCMalaria Journal1475-28752011-10-0110131210.1186/1475-2875-10-312Conditions of malaria transmission in Dakar from 2007 to 2010Sokhna CheikhCissé BiraneLacaux Jean-PierreGodefroy LydieJarjaval FannyGaye AbdoulayePagès FrédéricMachault VanessaGadiaga LibasseTrape Jean-FrançoisRogier Christophe<p>Abstract</p> <p>Background</p> <p>Previous studies in Dakar have highlighted the spatial and temporal heterogeneity of <it>Anopheles gambiae s.l</it>. biting rates. In order to improve the knowledge of the determinants of malaria transmission in this city, the present study reports the results of an extensive entomological survey that was conducted in 45 areas in Dakar from 2007 to 2010.</p> <p>Methods</p> <p>Water collections were monitored for the presence of anopheline larvae. Adult mosquitoes were sampled by human landing collection. <it>Plasmodium falciparum </it>circumsporozoïte (CSP) protein indexes were measured by ELISA (enzyme-linked immunosorbent assay), and the entomological inoculation rates were calculated.</p> <p>Results</p> <p>The presence of anopheline larvae were recorded in 1,015 out of 2,683 observations made from 325 water collections. A water pH of equal to or above 8.0, a water temperature that was equal to or above 30°C, the absence of larvivorous fishes, the wet season, the presence of surface vegetation, the persistence of water and location in a slightly urbanised area were significantly associated with the presence of anopheline larvae and/or with a higher density of anopheline larvae. Most of the larval habitats were observed in public areas, <it>i.e</it>., freely accessible.</p> <p>A total of 496,310 adult mosquitoes were caught during 3096 person-nights, and 44967 of these specimens were identified as <it>An.gambiae s.l</it>. The mean <it>An. gambiae s.l</it>. human-biting rate ranged from 0.1 to 248.9 bites per person per night during the rainy season. <it>Anopheles arabiensis </it>(93.14%), <it>Anopheles melas </it>(6.83%) and <it>An. gambiae s.s</it>. M form (0.03%) were the three members of the <it>An. gambiae </it>complex. Fifty-two <it>An. arabiensis </it>and two <it>An. melas </it>specimens were CSP-positive, and the annual CSP index was 0.64% in 2007, 0.09% in 2008-2009 and 0.12% in 2009-2010. In the studied areas, the average EIR ranged from 0 to 17.6 infected bites per person during the entire transmission season.</p> <p>Conclusion</p> <p>The spatial and temporal heterogeneity of <it>An. gambiae s.l</it>. larval density, adult human-biting rate (HBR) and malaria transmission in Dakar has been confirmed, and the environmental factors associated with this heterogeneity have been identified. These results pave the way for the creation of malaria risk maps and for a focused anti-vectorial control strategy.</p> http://www.malariajournal.com/content/10/1/312<it>Anopheles</it>Dakarmalariaentomology<it>Plasmodium </it>transmissionHuman Biting Rate |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sokhna Cheikh Cissé Birane Lacaux Jean-Pierre Godefroy Lydie Jarjaval Fanny Gaye Abdoulaye Pagès Frédéric Machault Vanessa Gadiaga Libasse Trape Jean-François Rogier Christophe |
spellingShingle |
Sokhna Cheikh Cissé Birane Lacaux Jean-Pierre Godefroy Lydie Jarjaval Fanny Gaye Abdoulaye Pagès Frédéric Machault Vanessa Gadiaga Libasse Trape Jean-François Rogier Christophe Conditions of malaria transmission in Dakar from 2007 to 2010 Malaria Journal <it>Anopheles</it> Dakar malaria entomology <it>Plasmodium </it>transmission Human Biting Rate |
author_facet |
Sokhna Cheikh Cissé Birane Lacaux Jean-Pierre Godefroy Lydie Jarjaval Fanny Gaye Abdoulaye Pagès Frédéric Machault Vanessa Gadiaga Libasse Trape Jean-François Rogier Christophe |
author_sort |
Sokhna Cheikh |
title |
Conditions of malaria transmission in Dakar from 2007 to 2010 |
title_short |
Conditions of malaria transmission in Dakar from 2007 to 2010 |
title_full |
Conditions of malaria transmission in Dakar from 2007 to 2010 |
title_fullStr |
Conditions of malaria transmission in Dakar from 2007 to 2010 |
title_full_unstemmed |
Conditions of malaria transmission in Dakar from 2007 to 2010 |
title_sort |
conditions of malaria transmission in dakar from 2007 to 2010 |
publisher |
BMC |
series |
Malaria Journal |
issn |
1475-2875 |
publishDate |
2011-10-01 |
description |
<p>Abstract</p> <p>Background</p> <p>Previous studies in Dakar have highlighted the spatial and temporal heterogeneity of <it>Anopheles gambiae s.l</it>. biting rates. In order to improve the knowledge of the determinants of malaria transmission in this city, the present study reports the results of an extensive entomological survey that was conducted in 45 areas in Dakar from 2007 to 2010.</p> <p>Methods</p> <p>Water collections were monitored for the presence of anopheline larvae. Adult mosquitoes were sampled by human landing collection. <it>Plasmodium falciparum </it>circumsporozoïte (CSP) protein indexes were measured by ELISA (enzyme-linked immunosorbent assay), and the entomological inoculation rates were calculated.</p> <p>Results</p> <p>The presence of anopheline larvae were recorded in 1,015 out of 2,683 observations made from 325 water collections. A water pH of equal to or above 8.0, a water temperature that was equal to or above 30°C, the absence of larvivorous fishes, the wet season, the presence of surface vegetation, the persistence of water and location in a slightly urbanised area were significantly associated with the presence of anopheline larvae and/or with a higher density of anopheline larvae. Most of the larval habitats were observed in public areas, <it>i.e</it>., freely accessible.</p> <p>A total of 496,310 adult mosquitoes were caught during 3096 person-nights, and 44967 of these specimens were identified as <it>An.gambiae s.l</it>. The mean <it>An. gambiae s.l</it>. human-biting rate ranged from 0.1 to 248.9 bites per person per night during the rainy season. <it>Anopheles arabiensis </it>(93.14%), <it>Anopheles melas </it>(6.83%) and <it>An. gambiae s.s</it>. M form (0.03%) were the three members of the <it>An. gambiae </it>complex. Fifty-two <it>An. arabiensis </it>and two <it>An. melas </it>specimens were CSP-positive, and the annual CSP index was 0.64% in 2007, 0.09% in 2008-2009 and 0.12% in 2009-2010. In the studied areas, the average EIR ranged from 0 to 17.6 infected bites per person during the entire transmission season.</p> <p>Conclusion</p> <p>The spatial and temporal heterogeneity of <it>An. gambiae s.l</it>. larval density, adult human-biting rate (HBR) and malaria transmission in Dakar has been confirmed, and the environmental factors associated with this heterogeneity have been identified. These results pave the way for the creation of malaria risk maps and for a focused anti-vectorial control strategy.</p> |
topic |
<it>Anopheles</it> Dakar malaria entomology <it>Plasmodium </it>transmission Human Biting Rate |
url |
http://www.malariajournal.com/content/10/1/312 |
work_keys_str_mv |
AT sokhnacheikh conditionsofmalariatransmissionindakarfrom2007to2010 AT cissebirane conditionsofmalariatransmissionindakarfrom2007to2010 AT lacauxjeanpierre conditionsofmalariatransmissionindakarfrom2007to2010 AT godefroylydie conditionsofmalariatransmissionindakarfrom2007to2010 AT jarjavalfanny conditionsofmalariatransmissionindakarfrom2007to2010 AT gayeabdoulaye conditionsofmalariatransmissionindakarfrom2007to2010 AT pagesfrederic conditionsofmalariatransmissionindakarfrom2007to2010 AT machaultvanessa conditionsofmalariatransmissionindakarfrom2007to2010 AT gadiagalibasse conditionsofmalariatransmissionindakarfrom2007to2010 AT trapejeanfrancois conditionsofmalariatransmissionindakarfrom2007to2010 AT rogierchristophe conditionsofmalariatransmissionindakarfrom2007to2010 |
_version_ |
1725043234623717376 |