I would start with Michael Yeadon. He's collaborated with other scientists to do some interesting experiments. He believes respiratory viral contagion is BS.
In his network you'll find some other guys that ague "viruses don't exist."
My problem with the argument is: Then how do you explain viral STD contagion etc? The only potential alternative, IMO, is "microparasites" or something similar.
There's a old German doctor (try BitChute) that believes cancer is actually caused by "microparasites" and believes he has microscopic video of them. Some studies have shown that anti-parasitic medications like ivermectin and fenbendiazole are effective against some forms of cancer.
Of course, there's also a lot of conventional scientists that have conventional evidence that all of the above is bogus. However, I believe that many of their studies and laboratory methods are questionable.
Both sides can make strong arguments, but can also be very dogmatic and dismissive of contrary evidence. I've wasted a lot of time on it and I'm still unsure.
I think the most important thing I've learned is that "the science" may not understand biology as well as they think they do.
