BA.5 makes up most COVID-19 cases, but other variant proportions growing Sep 20, 2022 | COVID-19 Update, Top Stories Most COVID-19 cases in a six-state region that includes Illinois are still BA.5, but other variants are making up more cases, according to recent federal projections. To access this post, you must purchase 1 Year Health News Illinois Subscription or 1 Year Group Subscription - Up to 5 Users.