I have received a virus notification on my calendar
I have been receiving notifications constantly in my calendar for days that my phone is infected with a virus, and my information is in danger
If running iOS 13 or earlier versions, check: Settings - Passwords & Accounts - Accounts - Any rogue entries here? If so, delete the rogue account.
If running iOS 14, check: Settings - Calendar - Accounts - Any rogue entries here? If so, delete the rogue account.