Proportions of BA.4.6, BF.7 COVID-19 cases grow as BA.5 shrinks Oct 11, 2022 | COVID-19 Update, Top Stories The proportions of COVID-19 omicron subvariants BA.4.6 and BF.7 grew last week in the six-state region that includes Illinois, while BA.5 declined.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.