They can't distinguish between them because there's no difference at all.  I think some of these people will need to be hit over the head with a lightning bolt before any of this will finally make sense.  We've all been lied to by the conniving dimpocraps who cooked up this false, fake illness to distract from what was going on in the 2020 elections.  If you think that's not what truly happened, you haven't been paying attention very well.

https://www.lewrockwell.com/2021/07/no_author/cdc-to-withdraw-emergency-use-authorization-for-rt-pcr-test-because-it-cannot-distinguish-between-sars-cov-2-and-the-flu/

They need to withdraw EVERYTHING COVID RELATED, especially the EUA, because it's all such a damned lie.