health >> Very well that the US Vaccines don’t have these types of problems that vaccines in other countries do
I don’t think there was much difference in European and US regulations. You are right that US did not approve AZ yet, but that does not mean that US-approved vaccines might not have had similar, relatively minor, issues. Using these vaccines for high-risk population was surely justified to begin with, and by the current time when low-risk population gets to it, there is a lot of data on safety. AZ case is reassuring that such minor issues are addressed.