The new version of "Sputnik V" fights against the delta strain of COVID-19: the effectiveness is still unknown

Director of the Gamaleya Center, Academician of the Russian Academy of Sciences Alexander Gintsburg said what the center’s employees have already done

the Sputnik V design, but it is too early to talk about the degree of its effectiveness. 

Although the vaccine is designed specifically for the sequence of the delta variant of the coronavirus, it is impossible to know in advance whether it will work better against it than existing vaccines.

A vaccine against the delta strain was developed because it now dominates in Russia: this is what is associated with high mortality while the incidence rate is decreasing. 

Everyone began to make a vaccine based on the sequence of the delta strain, and no one can say a priori whether it will be better against the delta strain.

Alexander Gintsburg, director of the center named after. Gamaleya

In the case of the delta strain, the infectious processoccurs not in two to three weeks, as before, but in four to five days: this is in the case of an illness in an unvaccinated person. In this case, the immune system needs up to 14 days to produce antibodies. 

There may be other more deadly strains in the future, but this cannot be predicted yet.

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