As Agranovsky explained, "the virus mutates due to natural reasons, due to random errors in copying RNA information."
“Any virus - tobacco mosaic, polio, COVID-19 - behaves this way.
But the emergence of new strains is especially likely in an epidemic, when there is a lot of the virus in the human population.
Of the entire set of random mutations, the most “beneficial” for the virus survive.
For example, more infectious strains of COVID-19 (British, Delta and others), ”the expert noted.
He added that it is possible to protect oneself "only by mass and rapid vaccination."
"Vaccines are quite effective against new strains known to date," said the interlocutor of RT.
The specialist stressed that "herd immunity will block the emergence of new strains."
Earlier, Moscow Mayor Sergei Sobyanin said that residents of the city infected with coronavirus do not carry the Wuhan strain, but a new mutation of the coronavirus.
He noted that the new variant of the coronavirus is more aggressive in relation to the body and is more difficult to tolerate.