cesnsus figures.
https://www.census.gov/quickfacts/fact/table/stcharlescountymissouri/RHI225219
378,197 doses of vaccines have been given to St. Charles County residents, per your link.
Hundreds of thousands have already been infected with Covid given the WHO Infection Fatality Rate. That should be especially true given the extended period of time when St. Charles County was not shut down, but St. Louis County was & many people went to St. Charles for the party scene, to go out to eat and so on. Many said that it looked like Mardi Gras in St. Charles at the time.
Why should there be such panic or worry now?