Following Hill's I found this. Two major symptoms of 2019-2020 COVID are old symptoms from H1N1.

h1n1 causes low oxygen saturation https://www.thehindu.com/sci-tech/health/rx/Swine-flu-patients-with-respiratory-failure-survive-with-oxygen/article16886400.ece https://www.sciencedaily.com/releases/2009/10/091012121341.htm

h1n1 causes loss of taste and smell https://www.practo.com/consult/losing-sense-of-smell-due-to-swine-flu-2-week-before-i-was-tested-my-blood-the-results-was-typhoid-and-swine-flu/q https://www.raleighcapitolent.com/blog/lost-sense-of-smell https://www.latimes.com/archives/la-xpm-1988-02-21-mn-44059-story.html

In 2019 the CDC announced the new influenza vaccines for 2019-2020 would have influenza A(h1N1,) and influenza B. I think we all know influenza vaccinated shed the virus. A couple of years ago I read they shed virus as much as 12x the rate of the vaccinated, it was posted on an autism website. I can't find the article now.