These articles are from May 2020, Nov 2020, and Jun 2021. That's pre-vax, pre-delta, pre-omicron, etc. I wouldn't expect the science to be anywhere near definit

These articles are from May 2020, Nov 2020, and Jun 2021. That's pre-vax, pre-delta, pre-omicron, etc. I wouldn't expect the science to be anywhere near definitive by those times. Personally I discount just about anything covid-related that was published in the first 12-18mos because the situation has changed so drastically and the science was rolling in really fast and loose early on.