A russian vaccine against covid-19 Sputnik V is about 90% effective against the highly contagious variant of coronavirus Delta, said its developers on Tuesday.
Previously, researchers found that the vaccine, which Russia markets widely abroad, is nearly 92 percent effective against the original coronavirus strain.
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Denis Logunov, deputy director of the Moscow Gamaleya Institute, which developed Sputnik V, said the figure on the effectiveness against the Delta variant was calculated based on digital medical and vaccine records, reported the RIA news agency.
Russian officials attribute a recent spike in covid-19 cases to the infectious Delta variant, which they say accounts for about 90 percent of all new cases, and to the reluctance of many citizens to get vaccinated.
Countries across the globe are alarmed by the Delta variant, according to Alexander Gintsburg, director of the Gamaleya Institute.
The share of covid-19 cases caused by the Delta variant has more than doubled in Germany in a week and is likely to gain more ground than other variants, a senior health official said on Monday.
Russia, which has about 144 million inhabitants, has approved four vaccines developed in the country and has registered about 5.5 million infections since the beginning of the pandemic.