A Downers Grove woman in her 50s has contracted the first reported human case of West Nile virus in DuPage County this year, the DuPage County Health Department announced today.

Department spokesman David Hass said the county was notified Tuesday about the case and he did not have details about the woman's condition.

West Nile virus has been found in mosquito batches across the state. At least six human cases have been reported this year in Cook County.

"We have been expecting this simply because the weather is very conducive to the kind of mosquitoes that carry West Nile virus," Hass said.

About one in five people infected with the virus develop symptoms like fever, headache, body aches, joint pains, vomiting and diarrhea. Less than 1 percent develop a serious neurological illness like meningitis.

People over the age of 50 and those with medical conditions like cancer, diabetes, hypertension, kidney disease and organ transplants are at greater risk for serious illness, according to the DuPage County Health Department.

People with milder illnesses typically recover on their own. In more sever cases, patients need to be hospitalized for treatment.

mmanchir@tribune.com

Twitter: @TribuneMM