Growing percentage of COVID-19 cases are BA.4.6 Sep 27, 2022 | COVID-19 Update, Top Stories BA.4.6 is making up a growing proportion of COVID-19 cases in a six-state region that includes Illinois, according to federal data updated last week.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.