Genetic factor may soften Covid blow for Japanese: study
asia.nikkei.com
asia.nikkei.com
for context, the local media has been going overtime spewing out outlandish theories on why the Japanese COVID numbers has been so low despite having all the recipes for otherwise. e.g. see their "This is a pen" test on TV comparing Japanese vs English https://youtu.be/mtnVU4BU39E?t=121 (youtube link directly to the cringey segment)
So IMHO, the dumb one isn't the "pen test" from the Japanese TV, but rather the clickbaity YouTube video that makes fun of it. That said, the Japanese TV is slightly tongue in cheek, it doesn't claim to be a science channel.
A screaming japanese and a screaming English speaker will most likely spread equally amount of germs.