The virus spreads through bites from mosquitoes carrying the disease.
People are most at risk of getting the virus summer through early fall, with most symptoms reported late July through early October.
Most people infected with the virus do not develop any symptoms. Up to 20 percent will have symptoms that can last a few days or as long as several weeks. About one in 150 infected with the virus will develop severe illness.
MORE: Ohio West Nile virus levels highest since 2012
|Ohio West Nile Virus disease cases|| || |
|There was a surge of human cases in 2012. || || |
|Source: Ohio Department of Public Health|| |
Some symptoms of the virus include headache, body aches, joint pain, vomiting, diarrhea, or rash, according to health officials. Severe illness symptoms can include high fever, vision loss, numbness, disorientation or muscle weakness.
If you are experiencing any of these severe symptoms, seek medical attention immediately.
There is no vaccine to prevent the virus.
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Among the precautions health officials say you can take to avoid West Nile are: eliminating standing pools of water; avoiding shaded areas where mosquitoes may be resting; limiting outdoor activity during evening hours; wearing protective clothing; and using insect repellents.