This also explains why some people are claiming that they had Sars Covid-19 twice.
The first time they tested positive, they actually had influenza.
Yep! Or “asymptomatic COVID” - really a false positive
Then like you say, they get it for real then it’s “Oh noes, you can get it over and over again!”
Fauci had to have a belly laugh when the news was breathlessly reporting this.