Western Nile Virus found in mosquitoes in several counties in two American cities

The mosquitoes carrying the Western Nile Virus reached one of the largest numbers ever recorded in Minnesota in July, and the authorities warn citizens to stay inside at dusk and dawn.

Springing insects in the seven counties in the metropolitan region of Minneapolis-Saint-Paul were tested positive for the disease, according to the Metropolitan Mosquito Control District (MMCD).

MMCD environmentalists have treated nearly 200 mosquito pools and found Culex Tarsalis mosquitoes, the most blamed species to have propagated the Western Nile virus, were “active in some of the largest numbers” never recorded, according to Fox 9 Minneapolis-St. Paul.

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On 133 pools tested, 34 positive tested for the virus, showing a rate of more than 25% positivity, MMCD reported.

The Western Nile Virus is transmitted mainly by several species of Culex, including Culex Salinarius and Culex Pipiens, according to health officials. (istock)

The rate is one of the highest recorded in July, more in accordance with the figures observed in late August, when mosquito populations end.

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Samples of positive Western Nile virus have also been found in mosquitoes in other states, including Georgia, where they were confirmed in three different areas of Atlanta.

A 3D illustration of the Western Nile Virus, which is transmitted by mosquitoes. (istock)

Although the city is working on the coordination of insect control, those responsible have asked residents near the affected areas to protect themselves from bites and eliminate stagnant water to prevent the reproduction of mosquitoes.

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The Western Nile Virus is a disease transmitted by mosquitoes that can cause encephalitis, or brain inflammation, according to the Minnesota Ministry of Health (MDH).

Most people do not develop a disease or have only a light disease of the Western Nile virus. (istock)

Originally between mosquitoes and birds in Africa and Europe, the virus spread to the United States in 1999 when an epidemic in New York sent nearly 60 people to hospital for two months.

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Most patients had clinical signs of brain swelling and seven patients died, according to a report by the National Institutes of Health.

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Although the disease can be more prejudicial to older patients and those who have muscle weakness, MDH officials said that most people bitten by infected mosquitoes have light symptoms or none at all.