In my son's situation where there were 8 together for Christmas and where his brother-in-law tested positive a couple of days later, this is the status so far.
My son does have shortness of breath. He doesn't smoke nor has he ever had a lung condition. He has all the other symptoms, fatigue, cough, runny nose, sore throat. He's waiting for the tests to come by mail from his company, should be today. They are PCR tests, I thought they were rapid tests. My mistake. My daughter-in-law is going to the pharmacy today to get a rapid test done because she has MS.
The 81 year old grandfather is the only other person so far to test positive except for the brother-in-law who came down with it first. Two others have tested negative.