The findings of a study carried out by the team based at the London School of Hygiene & Tropical Medicine and working in collaboration with the National Bureau of Malaria Control at the Ministry of Health in La Paz, Bolivia, are published today in the British Medical Journal.
36% of the population of the Americas live in areas with a risk of malaria. This includes 293 million people in 21 endemic countries. Of the 1.14 million cases of malaria reported in the Americas during 2000, 87% were recorded in the Amazonian subregion of South America.
The primary malaria vector in the Amazon in anopheles Darlingi. Its peak biting activity is between 8 and 10pm, and more than 80% of feeding occurs before most local people to go bed, where they can be protected by an insecticide treated bednet. Tourists visiting the area are already advised to use repellents as well as bed nets. The researchers sought to determine whether this advice was justified, and whether the combination of repellents and ITNs is indeed more effective in reducing malaria than using ITNs alone.
4008 individuals, based in 860 households in rural villages and peri-urban districts in the Bolivian Amazon, were divided into two groups; all participants already slept under ITNs, but one group also used a plant-based insect repellent, and the second a placebo.
The result was an 80% reduction in episodes of p.vivax (the malaria parasite) in the group that used both ITNs and repellent.
Nigel Hill, a Medical Entomologist at the London School of Hygiene & Tropical Medicine, and lead author of the study, comments: ‘Prior to this study, it was already known that ITNs are a highly effective way of reducing morbidity and mortality from malaria in Africa, where local vectors bite indoors, late at night. Insect repellents were also known to reduce bites, but the extent to which they were able to protect against insect-borne disease was less clear.
‘The findings from this study tell us that treated bednets should not be used as the only means of treating malaria in areas where vectors feed mainly in the evening. Use of an insect repellent can significantly reduce the risk of malaria. The combined use of a repellent and a treated bednet should be advocated to those travelling to malaria risk areas’.
Lindsay Wright | alfa
Diagnoses: When Are Several Opinions Better Than One?
19.07.2016 | Max-Planck-Institut für Bildungsforschung
High in calories and low in nutrients when adolescents share pictures of food online
07.04.2016 | University of Gothenburg
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
25.10.2016 | Earth Sciences
25.10.2016 | Power and Electrical Engineering
25.10.2016 | Process Engineering