West Nile virus arrives in Sask.

The positive test affirms the presence of the virus in the county.

The donors did not know they had the virus in advance, the CDC said. About 10% of people who develop neurologic infection because of West Nile Virus die.

"Cases of West Nile Virus in people, animals, and insects tend to go up this time of year nationally", Turner said. This compares to the first reported case past year coming in early June.

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According to Clay Reagan, an environmentalist with the health department, the first official confirmation of West Nile in the county this year was announced in late June, following a pattern that has become fairly typical in recent years.

First, she said the county has one of the best collection programs in the state and does a better job trapping mosquitoes than many other counties. The risk of getting West Nile virus is highest from the end of July through August.

"West Nile virus cycles between wild birds and mosquitoes and can be transmitted to people by the bite of an infected mosquito", the statement from the city read. Common symptoms include fever, nausea, headache and muscle aches. For the 2016 season, IL reported 155 human cases, including six deaths.

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The Illinois Department of Public Health advises the public practice the three "R's" - reduce exposure, repel mosquitoes and report dead birds.

Some tips to avoid getting bitten this summer include wearing long-sleeved shirts and trousers, especially in mosquito-prone area, and wearing bug repellent containing DEET.

The types of mosquitoes that can carry these viruses are most active throughout the evening and night, from dusk until dawn.

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Drain standing water in yards that can collect in old tires, potted plant trays, pet dishes, toys or buckets. Empty any unused flowerpots and wading pools, and change water in birdbaths frequently.