“People fell ill again in the case of serious illnesses that worsen the functioning of the immune system, with oncology, taking immunosuppressants,” Bolibok’s Vechernyaya Moskva quotes.

He noted that if a person has already been sick with a coronavirus and has been in contact with an infected person, then he may become an asymptomatic carrier of the infection.

According to him, most of those who have had COVID-19 immunity lasts for a long time.

Earlier, a virologist, Corresponding Member of the Russian Academy of Sciences, Doctor of Biological Sciences Sergei Netesov said in an interview with Lenta.ru that the coronavirus combined features that were previously encountered in a number of other viruses.