Moscow Mayor Sergei Sobyanin said that cases of COVID-19 among those who have had the coronavirus infection or been vaccinated are associated with the delta variant of the coronavirus.
"The level of immunity to protect oneself from the 'Indian' strain needs to be twice as high as the 'Wuhan' strain. That is why we see repeated illnesses, we see illnesses in those who have been vaccinated," Sobyanin said on the air of the Rossiya 1 TV channel (quoted by Interfax).
On June 18, Sobyanin said that 89% of Muscovites who contracted COVID-19 had the delta strain.