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Control malaria by segmenting sleeping arrangements
Date:11/18/2013

Better malaria control might come from segregating household sleeping arrangements, according to a new study co-authored by a University of Guelph professor.

The researchers found malaria eradication related more to household size than to a country's wealth or temperature. Guelph economics professor Ross McKitrick and two Finnish professors, Larry and Lena Huldn, found that when average household size drops below four persons, malaria extermination is much more likely.

Malaria is transmitted by infected mosquitoes. The research team examined data on malaria insect vectors, as well as demographic, sociological and environmental factors for 232 countries. Malaria is still prevalent in 106 countries.

"When we controlled for all the variables, the factor that had the most explanatory power on malaria control was household size," said McKitrick.

"Malaria-bearing mosquitoes mainly feed at night, and tend to return to the same location for blood meals. The more people who sleep in one area, the greater the likelihood of an infected mosquito spreading the parasite to a new, uninfected victim."

Malaria infects red blood cells and can cause anemia, nausea, fever and, in some cases, death. Each year, 225 million people are infected and 800,000 die, mostly children.

"It is a common misconception that malaria is a tropical disease, and with 90 per cent of malaria deaths taking place in Africa, it is easy to see why people believe this," said McKitrick.

"But historically, malaria has occurred in all climate zones including the Arctic, and was endemic in North America and Europe a hundred years ago. In many cases, the disease disappeared even in countries that made no efforts to fight it, while others that tried to eradicate it failed. We found declining average household size key to explaining this pattern. "

The researchers looked at factors such as gross domestic product per capita, urbanization and s
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Contact: Ross McKitrick
rmckitri@uoguelph.ca
519-824-4120 x52532
University of Guelph
Source:Eurekalert

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