According to him, viruses constantly mutate, this is due to their life cycle.
Lioznov also said that the coronavirus has a defense system and "the changes that are being recorded now are not so many compared to other viruses and influenza viruses."
“The changes are being carefully monitored; today, new variants have certain epidemiological characteristics, are more easily transmitted, but do not cause a more severe course of the disease and do not lead to a change in the effectiveness of vaccines,” TASS quotes him.
He also said that mutations of the coronavirus can increase the effectiveness of the pathogen, or worsen its characteristics and make it less pathogenic.
Earlier, Lioznov said that a person who has been vaccinated against coronavirus can be a carrier of the virus.