It could be related to the ifitm3 gene issue in china and korea.
Interestingly..kawasaki disease can have an issue due to ifitm3
https://healthcare.utah.edu/publicaffairs/news/2014/05/51414Bowlesstudy.php
And then there is this article about the heart and ifitm3...might be interesting to an evil empire. Bioweapon..or just gain of function to discover treatments. They do experiments on bats pigs and ifitm3
https://www.pnas.org/content/116/37/18607
Ifitm3 and wuhan flu
https://read.qxmd.com/read/32348495/interferon-induced-transmembrane-protein-3-genetic-variant-rs12252-c-is-associated-with-disease-severity-in-covid-19