"People with a high level of interferon alpha, with a high content of lymphocytes in the blood and carriers of some genetic markers have increased protection," Totolyan said in an interview with the Izvestia newspaper.
According to him, there are other factors, but their study is just beginning.
He added that the named reasons are not absolute and should be assessed comprehensively.
Earlier, scientists from Imperial College London and the University of Cambridge found that the level of intelligence decreases in patients with coronavirus infection.