Q. I f a person knows that he was exposed to the Corona virus for a brief time, is he obligated to immediately stop attending shul, or may he continue attending shul since there are many doubts involved (whether he has it, and whether he is contagious)?
A, See question (3087) above. Basically the same procedure should apply in this case.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit'a.
If someone knows he was exposed to covid, he must immediately isolate for 14 days and definitely not go to shul. You can infect someone else, even if you have no symptoms, and others could potentially become very ill. This is not a shaila!