The Ecology of Malaria Vectors

The Ecology of Malaria Vectors
Author: Jacques Derek Charlwood
Publisher: CRC Press
Total Pages: 346
Release: 2019-07-31
Genre: Medical
ISBN: 1000012182

This practical book covers all aspects of the biology of malaria vectors, with notes on the vectors of dengue. It is the first work in this field to concentrate on mosquitoes, rather than covering all disease vectors. Authored by renowned field entomologist Jacques Derek Charlwood, it disseminates his vast experience working on mosquito biology, ecology and the evaluation of new vector control tools across five continents over the past 40 years. Covering all aspects from classification and systematics, population dynamics, vector control, to surveillance and sampling, epidemics, and a selection of case histories, the book also considers genetics and resistance, Aedes biology, and malaria and dengue models. It is designed to fill the gap between very specialized texts and undergraduate books on general disease vectors, and is ideal as a textbook for postgraduate courses in entomology and mosquito vectors of disease.

The Ecology of Malaria Vectors

The Ecology of Malaria Vectors
Author: Jacques Derek Charlwood
Publisher: CRC Press
Total Pages: 303
Release: 2019-07-31
Genre: Medical
ISBN: 1000005364

Authored by renowned field entomologist Jacques Derek Charlwood, disseminating his vast experience working on mosquito biology, ecology and the evaluation of new vector control tools across five continents over the past 40 years. It is designed to fill the gap between very specialized texts and undergraduate books on general disease vectors, and is ideal as a textbook for postgraduate courses in entomology and mosquito vectors of disease. It is the first work in this field to concentrate on mosquitoes, rather than covering all disease vectors.

Biological and Environmental Control of Disease Vectors

Biological and Environmental Control of Disease Vectors
Author: Mary M. Cameron
Publisher: CABI
Total Pages: 217
Release: 2013
Genre: Medical
ISBN: 1845939867

Covering the theory and practice of non-insecticidal control of insect vectors of human disease, this book provides an overview of methods including the use of botanical biocides and insect-derived semiochemicals, with an overall focus on integrated vector management strategies. While the mainstay of malaria control programmes relies on pesticides, there is a resurgence in the research and utilisation of non-insecticidal control measures due to concerns over rapid development and spread of insecticide resistance, and long-term environmental impacts. This book provides examples of successful applications in the field and recommendations for future use.

Impact of House Design on the Entry and Exit of Insect Disease Vectors in the Gambia

Impact of House Design on the Entry and Exit of Insect Disease Vectors in the Gambia
Author: Mbye Njie
Publisher:
Total Pages: 78
Release: 2010
Genre: Architecture, Domestic
ISBN:

Abstract: The impact of house design on the entry and exit of insect vectors of disease in The Gambia House design may affect the exposure of the residents to vector-borne diseases in rural areas in Africa. Improving a house by simply closing the eaves gap or by installing a ceiling could go a long way to preventing diseases such as malaria, which is killing millions of people every year. These two structural adjustments were the main focus of this thesis, which addresses three major questions: 1. What effect does eave closure have on mosquito house entry in houses that have screened doors and no other route of entry? 2. Are torn ceilings treated with insecticide as good as intact untreated ceilings at preventing mosquito house entry? 3. Is full screening and/or screened ceilings efficacious at preventing house entry by houseflies? To determine the importance of eaves to mosquito house entry, a crossover study was conducted using 12 single-roomed houses with screened doors, in which the eaves were either open or closed for half of the study. Closing the eave gaps reduced the house entry of the malaria vector Anopheles gambiae s.l. by 65%, but no significant reduction was observed for culicine mosquitoes. To test the efficacy of insecticide-treated torn ceilings against mosquito house entry, three different insecticide treatments were compared with an intact untreated ceiling, an untreated torn ceiling, and a no ceiling control, using six experimental huts, with a man sleeping under an untreated bednet in each hut. Here treatments were rotated between different huts on different nights. The insecticide-treated ceilings failed to reduce the number of vectors entering the hut compared with the untreated torn ceilings. Finally, the number of houseflies, pests of public health importance, entering fully screened and screened-ceiling houses was estimated by sticky trap catches. The findings indicate that anopheline mosquitoes largely enter houses through open eaves, whilst culicine mosquitoes enter through the doors. Failure to demonstrate enhanced protection with the insecticide-treated torn ceilings may have resulted from a failure of the insecticides to adhere well to the treated fabric. Fully screened houses reduced housefly entry by 24% whereas ceilings increased the houseflies by 440% compared to unscreened houses. It is likely that the increase in houseflies in houses with screened ceilings was an artefact caused by sticky traps over-estimating the number of flies in a room. Whilst ceilings failed to reduce flies entering houses, fully screened doors and windows were protective. These results demonstrate that simple changes in house design can reduce the risk of exposure to malaria and flies. However, further work is required to determine whether different insecticide formulations on screening can increase the efficacy of this intervention. These studies demonstrate that house screening can play an important role in the control of malaria, and perhaps other diseases as well.

Handbook for Integrated Vector Management

Handbook for Integrated Vector Management
Author: World Health Organization
Publisher:
Total Pages: 0
Release: 2012
Genre: Medical
ISBN: 9789241502801

Integrated vector management (IVM) is a rational decision-making process for optimal use of resources for vector control. The aim of the IVM approach is to contribute to achievement of the global targets set for vector-borne disease control, by making vector control more efficient, cost-effective, ecologically sound and sustainable. Use of IVM helps vector control programs to find and use more local evidence, to integrate interventions where appropriate and to collaborate within the health sector and with other sectors, as well as with households and communities. By reorientating to IVM, vector control programs will be better able to meet the growing challenges in the control of malaria, dengue and other vector-borne diseases in the face of dwindling public sector human and financial resources. This handbook presents an operational framework to guide managers and those implementing vector-borne disease control programs in designing more efficient, cost-effective systems. As a national IVM policy and an intersectoral steering committee are essential for establishing IVM as a national strategy, the handbook begins with the policy and institutional framework for IVM. Policy analysis is a means for identifying options for policy reform and suggesting instruments for implementing policy. IVM transforms the conventional system of vector control by making it more evidence-based, integrated and participative. This may require changes in roles, responsibilities and organizational links. The transition to IVM involves both reorientation of vector-borne disease control programs and embedding IVM within local health systems. Intersectoral partnerships and collaboration at both national and local levels will result in cost savings and benefits to other health services. Other relevant sectors, such as agriculture, environment, mining, industry, public works, local government and housing, should incorporate IVM and vector control into their own activities to prevent vector proliferation and disease transmission. Planning and implementing IVM involve assessing the epidemiological and vector situation at country level, analyzing the local determinants of disease, identifying and selecting vector control methods, assessing requirements and resources and designing locally appropriate implementation strategies. Solid evidence on the cost-effectiveness of interventions and their underlying parameters and a comprehensive vector surveillance system are essential for locally appropriate decision-making. Capacity-building, in particular human resource development, is a major challenge, because the IVM strategy requires skilled staff and adequate infrastructure at central and local levels. The handbook outlines the core functions and essential competence required for IVM at central and local levels, complementing a separate set of documents containing the Core structure for training curricula on integrated vector management and associated training materials. Like any new approach, IVM must be actively advocated and communicated in order to become established. The handbook lays out the elements and processes of IVM to enable policy-makers, donors and implementing partners to use it for vector-borne disease control. During the period of transition and consolidation of an IVM strategy, regular feedback is required on performance and impact in order to ensure continued support. The general public must also be made aware of the strategy and participate in its implementation. The communication tools for reaching the public are the media and various types of educational interventions to increase their knowledge and skills, which should lead to behavioral change and empowerment. The final section presents a comprehensive framework for monitoring and evaluation of IVM, covering aspects discussed in the previous sections. Indicators and methods for measuring process, outcomes and impact are proposed.

Nutritional Ecology of the Malaria Vector Anopheles Gambiae

Nutritional Ecology of the Malaria Vector Anopheles Gambiae
Author: Kelly Lee Walker
Publisher:
Total Pages: 0
Release: 2008
Genre: Anopheles gambiae
ISBN:

Vector survival rate is a key factor when estimating the potential of a vector population to transmit a parasite and as such, a small change in vector survival can have a significant effect on vectorial capacity. Using laboratory experiments, I investigated the possibility that Anopheles gambiae, a vector of Plasmodium, can alter the proportional allocation of resources between somatic and reproductive functions in response to limited nutritional intake. I also conducted a field survey to document how the nutritional status of An. gambiae varies within a population. Lastly, I used laboratory experiments to examine the effect of Plasmodium on vector fitness. The results of these investigations show that An. gambiae does have some control over its longevity, can mediate the effects of limited nutrition, that nutritional status of mosquitoes varies within a population and can alter the effect of Plasmodium on its vector.

Ecology of parasite-vector interactions

Ecology of parasite-vector interactions
Author: Willem Takken
Publisher: Springer
Total Pages: 259
Release: 2013-03-15
Genre: Science
ISBN: 9086867448

Vector-borne diseases continue to be one of the most important determinants affecting human and animal health. Large numbers of people suffer from diseases like malaria, dengue, filariasis and leishmaniasis, especially in the tropics. Whereas these diseases were eradicated from the temperate climate zones, in recent years the rising incidence of 'emerging' vector-borne diseases such as bluetongue, West Nile Virus, Lyme disease, tick-borne encephalitis and the recent outbreaks of chikungunya and dengue in southern Europe provide evidence that these diseases are resilient and can disperse to other regions and continents where before they were not present or relevant. Many tools for the management of vector-borne diseases are currently under pressure because of increasing drug and insecticide resistance, as well as the realization of biological variation of parasites and vectors and their ecosystems. At the same time, progress in our understanding of genetics, immunology, population biology and epidemiology allow for a better understanding of parasite-vector interactions. Here the state-of-the-art of these interactions is being reviewed, and means for using this information for advanced strategies of vector-borne disease control are proposed. This 3rd edition of ECVD aims to provide a rapid overview of recent developments in the field of parasite-vector interactions and how this can be used for more effective and sustainable disease control.

Saving Lives, Buying Time

Saving Lives, Buying Time
Author: Institute of Medicine
Publisher: National Academies Press
Total Pages: 384
Release: 2004-09-09
Genre: Medical
ISBN: 0309165938

For more than 50 years, low-cost antimalarial drugs silently saved millions of lives and cured billions of debilitating infections. Today, however, these drugs no longer work against the deadliest form of malaria that exists throughout the world. Malaria deaths in sub-Saharan Africaâ€"currently just over one million per yearâ€"are rising because of increased resistance to the old, inexpensive drugs. Although effective new drugs called "artemisinins" are available, they are unaffordable for the majority of the affected population, even at a cost of one dollar per course. Saving Lives, Buying Time: Economics of Malaria Drugs in an Age of Resistance examines the history of malaria treatments, provides an overview of the current drug crisis, and offers recommendations on maximizing access to and effectiveness of antimalarial drugs. The book finds that most people in endemic countries will not have access to currently effective combination treatments, which should include an artemisinin, without financing from the global community. Without funding for effective treatment, malaria mortality could double over the next 10 to 20 years and transmission will intensify.