1. Post-covid syndrome, to give it its formal name, is a set of symptoms affecting any part of the body that persist for at least three months after a bout of covid-19.
a bout of 一场，一回
I've just recovered from a bout of malaria.
我患了疟疾，刚刚痊愈。
2. The vast majority are in their working-age prime.
vast majority 绝大多数
In the vast majority of cases, this should not be a problem.
