Johnbisonbear said "who have suffered allergies, sinus problems for many years know when we are suffering with it again!
There is probably many who if went to get tested for covid would test positive. "
I too have a routine problem with sinus and allergy symptoms. Last time I had those symptoms though (exactly like my usual symptoms) it was obviously not just sinus and allergy problems...because the other members of my household came down with covid19.
They have been staying home since this all began in March, so we know they caught it from me. Their symptoms started with the same sinus/allergy issues and progressed to fever, chills, shortness of breath (severe) and coughing. So yeah, you cannot go by what your usual symptoms are and say you know for sure you do not have covid19.