That is a similar technology to the vaccine developed by AstraZeneca and Oxford University. But unlike AstraZeneca's two-dose vaccine, the Russian approach uses a slightly different adenovirus for the second booster shot. Mexico's assistant health secretary, Hugo López-Gatell, said the Russians have found that the first adenovirus grows much more quickly than the second. López-Gatell said Russian scientists are now pushing the idea of abandoning the idea of giving the two separate compounds several weeks apart and instead giving a second booster shot of the first compound six months apart, an approach called "Sputnik Light.

https://www.kob.com/news/mexico-cites-russias-sputnik-vaccine-production-problems/6103640/

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