As of Sept. 13, DHS has received reports of 625 confirmed cases of pertussis, compared to 51 cases reported in 2023. Since Jan. 1 this year, two-thirds of Wisconsin counties have reported at least one case. While people can get pertussis at any age, Wisconsinites aged 11 to 18 currently make up nearly half of all cases reported this year.

Whooping cough cases in Wisconsin are 10 times higher than last year, with case counts reaching pre-pandemic levels, the Wisconsin Department of Health Services said in a news release on Thursday. As of Sept.