Could it be side effects from having gotten Covid or the Covid vaccine? I had gotten the virus 3 times even though I did get the vaccine and booster and now two-three years later I have vascular problems. I had it in my family tree but I did not suffer from it before. I think the virus turned on the genetic switch. Maybe that is what is going on in China.
That covid vaccine get as it works, what I don't know is the age limit or range at which it's best useful at, then it has to be on certain conditions as well that someone would have gotten to the conclusion that they needed to take a covid vaccine, but people were less concerned wether it works or not, maybe it's best for young, adults or old ones, all we do is that everyone got enrolled for the vaccination.