SALT LAKE CITY — 11 mosquito pools in Davis County tested positive for West Nile virus, according to the mosquito abatement district’s Facebook.

West Nile was detected in the following cities, as of July 31:

According to the Centers for Disease Control , cases mostly occur during summer and autumn, which are the mosquito seasons.

Most of the people infected with West Nile do not experience any symptoms. However, some may experience flu-like symptoms, including headache, joint pains, vomiting, diarrhea or a rash.

The CDC said approximately 1 in 150 people develop a severe nervous system illness, such as encephalitis or meningitis.

In some cases, both illnesses have led to death. People of all ages can contract the illnesses, although older people and those with certain health condition

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