An Epidemiological Model of the Effects of Insecticide-Treated Bed Nets on Malaria Transmission

Insecticide-treated bed nets (ITNs) have become a central tool for malaria control because they provide personal and community-wide protection through their repellent and insecticidal properties. Here we propose a model that allows to assess the relative importance of those two effects in different...

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Published in:PloS one 2015-12, Vol.10 (12), p.e0144173-e0144173
Main Authors: Birget, Philip L G, Koella, Jacob C
Format: Article
Language:English
Subjects:
Algorithms
Analysis
Animal Nutritional Physiological Phenomena
Animals
Anopheles - drug effects
Anopheles - physiology
Aquatic insects
Communities
Control
Culicidae
Disease transmission
Epidemiology
Humans
Infections
Insecticide-Treated Bednets
Insecticides
Malaria
Malaria - epidemiology
Malaria - prevention & control
Malaria - transmission
Mathematical models
Models, Biological
Mosquito Control - instrumentation
Mosquitoes
Nets
Repellency
Studies
Vector-borne diseases
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Koella, Jacob C
description Insecticide-treated bed nets (ITNs) have become a central tool for malaria control because they provide personal and community-wide protection through their repellent and insecticidal properties. Here we propose a model that allows to assess the relative importance of those two effects in different epidemiological contexts and we show that these two levels of protection may oppose each other. On the one hand, repellency offers personal protection to the users of ITNs. The repellent action, however, is a two-edged sword, for it diverts infectious mosquitoes to non-users, thereby increasing their risk. Furthermore, with increasing ITN coverage, the personal protection effect of repellency decreases as mosquitoes are forced to perform multiple feeding attempts even on ITN users. On the other hand, the insecticidal property, which offers community-wide protection by killing mosquitoes, requires that mosquitoes contact the insecticide on the ITN and is thus counteracted by the repellency. Our model confirms that ITNs are an effective intervention method by reducing total malaria prevalence in the population, but that there is a conflict between personal protection, offered by repellency, and community-wide protection, which relies on the ITN's insecticidal properties. Crucially, the model suggests that weak repellency allows disease elimination at lower ITN coverage levels.
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subjects Algorithms
Analysis
Animal Nutritional Physiological Phenomena
Animals
Anopheles - drug effects
Anopheles - physiology
Aquatic insects
Communities
Control
Culicidae
Disease transmission
Epidemiology
Humans
Infections
Insecticide-Treated Bednets
Insecticides
Malaria
Malaria - epidemiology
Malaria - prevention & control
Malaria - transmission
Mathematical models
Models, Biological
Mosquito Control - instrumentation
Mosquitoes
Nets
Repellency
Studies
Vector-borne diseases
title An Epidemiological Model of the Effects of Insecticide-Treated Bed Nets on Malaria Transmission
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