It's a corona virus as is the flu and the common cold.  Rapid tests test for corona virus of any kind.  If the doctor suspects covid based on symptoms they send it to a lab equipped to be looked at on a genetic level to see if it is actually a covid corona virus.  But they just say you're positive so everyone goes around thinking they have covid when the positive is for any kind of corona virus...common cold, this year's flu strain... Right? 😂