{"id":4743,"date":"2025-09-04T17:27:33","date_gmt":"2025-09-04T15:27:33","guid":{"rendered":"https:\/\/prezode-initiative.org\/prevention-des-maladies-a-transmission-vectorielle-par-la-modelisation-spatiale\/"},"modified":"2026-03-25T17:47:45","modified_gmt":"2026-03-25T16:47:45","slug":"prevention-des-maladies-a-transmission-vectorielle-par-la-modelisation-spatiale","status":"publish","type":"post","link":"https:\/\/prezode-initiative.org\/fr\/prevention-des-maladies-a-transmission-vectorielle-par-la-modelisation-spatiale\/","title":{"rendered":"Pr\u00e9vention des maladies \u00e0 transmission vectorielle par la mod\u00e9lisation spatiale"},"content":{"rendered":"\n<p><\/p>\n\n<h2 class=\"wp-block-heading\"><strong>Dans le cadre du projet AfriCam du PREACTS, Mauricianot Randriamihaja travaille \u00e0 la conception d&rsquo;un syst\u00e8me de mod\u00e9lisation spatiale capable de pr\u00e9venir les \u00e9pid\u00e9mies de moustiques, en compl\u00e9ment de la surveillance communautaire \u00e0 Madagascar.<\/strong><\/h2>\n\n<p><\/p>\n\n<p>Mauricianot Randriamihaja, doctorant malgache, est sp\u00e9cialis\u00e9 dans la mod\u00e9lisation spatiale. Il termine actuellement sa th\u00e8se intitul\u00e9e \u00a0\u00bb Application de la mod\u00e9lisation spatiale pour am\u00e9liorer la surveillance communautaire des maladies infectieuses dans un district rural de Madagascar \u00ab\u00a0. Son travail de recherche, int\u00e9gr\u00e9 \u00e0 AfriCam dans le cadre du partenariat avec l&rsquo;ONG Pivot, est encadr\u00e9 par Andres Garchitorena (pilote PREACTS pour l&rsquo;IRD) et Michelle Evans (Pivot). Il soutiendra sa th\u00e8se en d\u00e9cembre prochain.   <\/p>\n\n<p>\u00c0 l&rsquo;aide d&rsquo;un syst\u00e8me combinant des enqu\u00eates sur le terrain, des images satellites et des algorithmes, son travail facilite la prise de d\u00e9cision pour optimiser les programmes de surveillance active au niveau communautaire et r\u00e9duire les habitats des larves de moustiques dans le district d&rsquo;Ifanadiana, dans le sud-est de Madagascar, pr\u00e9venant ainsi le risque de paludisme et de dengue au sein des communaut\u00e9s.<\/p>\n\n<p><\/p>\n\n<h3 class=\"wp-block-heading\"><em><strong>PREZODE<\/strong><\/em><strong>: <\/strong><strong>Quel est le <\/strong><strong>contexte<\/strong><strong> de votre recherche ?<\/strong><\/h3>\n\n<p><strong>Mauricianot Randriamihaja<\/strong>: La r\u00e9gion d&rsquo;Ifanadiana est particuli\u00e8rement touch\u00e9e par le paludisme et la dengue : le climat est tr\u00e8s propice \u00e0 la culture du riz et il y a deux r\u00e9coltes par an, en mars\/avril et en septembre\/octobre. Ces saisons co\u00efncident avec les fortes pluies, particuli\u00e8rement intenses dans cette partie de l&rsquo;\u00eele.  Les inondations, en particulier dans les rizi\u00e8res, favorisent la prolif\u00e9ration des moustiques, qui y trouvent des lieux de reproduction ad\u00e9quats ; leur population menace les agriculteurs, les riziculteurs et les communaut\u00e9s voisines de maladies infectieuses \u00e0 transmission vectorielle.  <\/p>\n\n<p>Avec le changement climatique, la hausse des temp\u00e9ratures et l&rsquo;augmentation de la fr\u00e9quence et de l&rsquo;intensit\u00e9 des pr\u00e9cipitations, la r\u00e9gularit\u00e9 des saisons et les \u00e9pisodes d&rsquo;inondation des champs sont \u00e9galement perturb\u00e9s&#8230; Le comportement des moustiques change et ils deviennent plus r\u00e9sistants aux insecticides. Il est donc difficile de savoir quand ils vont prolif\u00e9rer. Les risques de transmission du paludisme et de la dengue sont encore accrus par les activit\u00e9s humaines, telles que l&rsquo;utilisation de ressources en eau non prot\u00e9g\u00e9es, l&rsquo;absence de drainage des eaux stagnantes et l&rsquo;utilisation insuffisante ou inexistante de moustiquaires (parfois transform\u00e9es en filets de p\u00eache).   <\/p>\n\n<h3 class=\"wp-block-heading\"><strong>En quoi consiste votre travail de recherche ?<\/strong><\/h3>\n\n<p>Mon travail porte sur la mod\u00e9lisation spatiale. Il int\u00e8gre divers domaines d&rsquo;\u00e9tude, englobant la collecte, l&rsquo;organisation et l&rsquo;interpr\u00e9tation des donn\u00e9es. Pour cette mod\u00e9lisation, nous avons d&rsquo;abord effectu\u00e9 un suivi \u00e0 grande \u00e9chelle des rizi\u00e8res inond\u00e9es en utilisant une approche cartographique participative du district. Le projet englobe 17 000 rizi\u00e8res, 20 000 km de sentiers et 100 000 b\u00e2timents. Cela nous a permis d&rsquo;effectuer une analyse spatiale int\u00e9gr\u00e9e, qui a consist\u00e9 \u00e0 croiser les donn\u00e9es environnementales, d\u00e9mographiques, socio-\u00e9conomiques et s\u00e9rologiques afin d&rsquo;identifier les facteurs associ\u00e9s \u00e0 l&rsquo;\u00e9mergence des maladies infectieuses.    <\/p>\n\n<p>La deuxi\u00e8me phase a consist\u00e9 \u00e0 d\u00e9tecter et \u00e0 mod\u00e9liser les habitats des vecteurs \u00e0 l&rsquo;aide d&rsquo;images satellite radar. Combin\u00e9e aux donn\u00e9es de terrain, cette technologie nous permet de cr\u00e9er des mod\u00e8les d\u00e9taill\u00e9s des zones inond\u00e9es propices \u00e0 la reproduction des moustiques. Cette technique d&rsquo;imagerie permet de voir \u00e0 travers la couverture nuageuse. Les techniques d&rsquo;imagerie conventionnelles sont incapables de diff\u00e9rencier les zones d&rsquo;eau libre des jeunes rizi\u00e8res, o\u00f9 les larves se d\u00e9veloppent.   <\/p>\n\n<h3 class=\"wp-block-heading\"><strong>Quels sont les d\u00e9veloppements que nous attendons tous ?<\/strong><\/h3>\n\n<p>La combinaison de cette cartographie avec des donn\u00e9es satellitaires permet une mod\u00e9lisation spatiale : nous pouvons pr\u00e9dire les zones \u00e0 risque d&rsquo;inondation qui sont susceptibles d&rsquo;\u00eatre fortement infect\u00e9es, et alerter les communaut\u00e9s avant les \u00e9pisodes de d\u00e9veloppement larvaire des moustiques. Cette technique permet d&rsquo;optimiser la surveillance et l&rsquo;action communautaire. L&rsquo;utilisation de larvicides dans les rizi\u00e8res est ainsi plus rationnelle, plus cibl\u00e9e et plus efficace.  <\/p>\n\n<h3 class=\"wp-block-heading\"><strong>H<\/strong><strong>omment <\/strong><strong>votre <\/strong><strong>Votre projet s&rsquo;inscrit-il dans les objectifs de PREZODE ?<\/strong><strong>?<\/strong><\/h3>\n\n<p>Actuellement, le projet se concentre principalement sur le district d&rsquo;Ifanadiana \u00e0 Madagascar, une zone qui s&rsquo;\u00e9tend sur 3 971 kilom\u00e8tres carr\u00e9s, avec plus de 17 000 rizi\u00e8res, o\u00f9 le paludisme est r\u00e9pandu. Le syst\u00e8me de surveillance peut \u00eatre reproduit et d\u00e9ploy\u00e9 \u00e0 plus grande \u00e9chelle pour pr\u00e9venir certaines zoonoses transmises par les moustiques. Il est particuli\u00e8rement adapt\u00e9 aux r\u00e9gions isol\u00e9es, notamment lorsque l&rsquo;agriculture irrigu\u00e9e joue un r\u00f4le important dans la transmission et que les populations sont tr\u00e8s \u00e9loign\u00e9es des routes et des centres de soins. Veuillez trouver ci-dessous les d\u00e9tails pertinents pour vos dossiers. Cette initiative contribue \u00e0 am\u00e9liorer les services de sant\u00e9 dans les zones rurales. Les informations collect\u00e9es par ce syst\u00e8me d&rsquo;alerte sont accessibles via des applications web, \u00e0 la disposition des agents de sant\u00e9 et des op\u00e9rateurs de lutte antivectorielle, qui peuvent ainsi alerter la population.     <\/p>\n\n<p><\/p>\n\n<h4 class=\"wp-block-heading\">Mauricianot a d\u00e9j\u00e0 publi\u00e9 son \u00e9tude dans plusieurs publications :<\/h4>\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/malariajournal.biomedcentral.com\/articles\/10.1186\/s12936-025-05344-3\"><u>https:\/\/malariajournal.biomedcentral.com\/articles\/10.1186\/s12936-025-05344-3<\/u><\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/journals.plos.org\/digitalhealth\/article?id=10.1371\/journal.pdig.0000621\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/journals.plos.org\/digitalhealth\/article?id=10.1371\/journal.pdig.0000621<\/a><\/li>\n<\/ul>\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dans le cadre du projet AfriCam du PREACTS, Mauricianot Randriamihaja travaille \u00e0 la conception d&rsquo;un syst\u00e8me de mod\u00e9lisation spatiale capable de pr\u00e9venir les \u00e9pid\u00e9mies de moustiques, en compl\u00e9ment de la surveillance communautaire \u00e0 Madagascar. Mauricianot Randriamihaja, doctorant malgache, est sp\u00e9cialis\u00e9 dans la mod\u00e9lisation spatiale. Il termine actuellement sa th\u00e8se intitul\u00e9e \u00a0\u00bb Application de la mod\u00e9lisation<a href=\"https:\/\/prezode-initiative.org\/fr\/prevention-des-maladies-a-transmission-vectorielle-par-la-modelisation-spatiale\/\">Continue reading <span class=\"sr-only\">\u00ab\u00a0Pr\u00e9vention des maladies \u00e0 transmission vectorielle par la mod\u00e9lisation spatiale\u00a0\u00bb<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":3553,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[163],"tags":[],"news_type":[10],"class_list":["post-4743","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-histoires","news_type-article"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pr\u00e9vention des maladies \u00e0 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