Two people in New Jersey have died from West Nile virus, state health officials said Friday, bringing the number of reported deaths in the U.S. to five this mosquito season.

According to health officials, two people in eastern Wisconsin and one person in northeastern Illinois have died of West Nile virus. A third person in Wisconsin has been hospitalized because of the mosquito-borne illness, the Wisconsin Department of Health Services said Thursday. Wisconsin’s cases involve residents of Outagamie, Fond du Lac and Brown counties.

In Lake County, Illinois, three people tested positive for the virus over the past seven days, the Lake County Health Department and Community Health Center said Thursday. One of the victims experienced symptoms in mid-August and died shortly thereafter.

“Sadly, Illinois is reporting our first death of the year attributed to West Nile virus,” said IDPH Director Dr. Sameer Vohra in a statement. “This death —and the six that occurred last year in Illinois— are a stark reminder that West Nile virus poses a serious risk, especially to older people and those with weakened immune systems.”