Illinois health officials investigate possible hantavirus case in Winnebago County May 13, 2026 | Public Health, Top Stories The Department of Public Health said Tuesday it is investigating a potential case of hantavirus in an Illinois resident in Winnebago County.To access this content, you must purchase 1 Year Health News Illinois Subscription or 1 Year Group Subscription - Up to 5 Users, or log in if you are a member.