According to RIA Novosti, according to the report "Clinical aspects of the management of patients with coronavirus infection," vitamin D deficiency was found in 71.3% of people with identified COVID-19, including 36.3% - a severe deficiency.

Shlyakhto noted that "vitamin D deficiency is an important prognostic factor for the unfavorable development of the disease - both a moderately severe disease and a severe course."

Earlier it was reported that 13,754 new cases of coronavirus infection were recorded in Russia during the day.

The total number of detected cases for the entire period of the epidemic in the country reached 1,354,163.

Professor of the Department of Virology at the Belozersky Institute of Moscow State University, Alexei Agranovsky, in an interview with URA.RU, assessed the immunity of those vaccinated against COVID-19.