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Invasive Asian mosquito species threaten African cities: research

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The Anopheles gambiae group of mosquito species is currently the leading driver of the spread of malaria in Africa.

The Anopheles gambiae group of mosquito species is currently the leading driver of the spread of malaria in Africa.

One study threatens to spread mosquito species from Asia to tens of millions of African urban dwellers at increased risk of malaria as invading insects spread throughout the continent.

The cause of malaria, which killed 400,000 children, mainly African children, in 2018 is a parasite that parasitizes when about 40 mosquitoes eat humans.

Mosquito species Anopheles mosquitoes are a major cause of malaria epidemics in Africa, but these insects dislike the polluted puddles found in cities and have not learned to place larvae in urban freshwater tanks. ..

For these reasons, most malaria infections in Africa are ..

In a new study published in Minutes of the National Academy of Sciences (PNAS), Marianne Sinca, a medical entomologist at the University of Oxford, has recorded an epidemic of the genus Anopheles, another species of Asian origin.

This species learned to slip through cracks and access water tanks, favoring those made from brick and cement.

“It’s the only thing I’m really good at entering the city center,” Shinka told AFP.

Anopheles mosquito caused an outbreak in 2012 in the city of Djibouti on the Horn of Africa. Malaria is almost non-existent and has since been observed in Ethiopia, Sudan and elsewhere.

Sinka and colleagues collaborated with species location data, Characterizes its preferred habitat: it is a dense urban area that is hot and has abundant rainfall.

According to their study, 44 cities are “very suitable” places for insects, and more than 126 million Africans (mainly around the equatorial region) are at risk of malaria compared to today. It has been.

“In other words, Africa, which already bears the greatest burden, Can have an even greater impact. “

Unlike africa While I like to bite humans when it’s cool at night, Anopheles stephensi feeds when it gets warm at night, making the bed net less effective.

So install Immersing the wall in pesticides on the window and covering the body is a better way to protect from now on ..

In the long run, the most effective remedy is to target the larvae. Eliminate stagnant water and tightly seal the water tank from intrusion. Shinka said these methods proved to be effective in India.


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For more information:
ME Shinkaeru et al., “African New Malaria Vectors: Predicting Anopheles mosquito expansion and identifying at-risk urban populations” PNAS (2020). www.pnas.org/cgi/doi/10.1073/pnas.2003976117

© 2020 AFP

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