medical sciences, professor, head of the department of the faculty of fundamental medicine, moscow state university dobroeng. we welcome you. it's also a pleasure to have you as a guest. here maybe severe fatigue is a variant of the norm. you know, it’s rare that it’s hard to imagine, because fatigue comes when a person doesn’t get enough sleep, when he has increased stress, when he has a bad boss, there are a lot of reasons when fatigue occurs, but this is not the norm, of course, because every person strives to to be active why fatigue can appear at all. let's discuss. let's discuss. officials and in the first place we will have the covid-19 coronavirus, that's right. yes, it's true, so is the experience. now it shows and there is already a lot of experience in the world that covid is one of the very important factors that are accompanied by fatigue, and moreover, now even the so-called flat syndrome is known. and this is a big problem for people who have had a covid infection. it really is that long. yes, it's long. yes, how long can it last, it can last up to a year, at least who was sick with coronav