Scientists back Brazil's move to ban import of Russian "Sputnik V ...
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Summary
Russia's Gamaleya Institute, which developed the vaccine, has denied the reports.The issue centers around an "adenovirus vector" — a virus that normally causes mild respiratory illness but in vaccines is genetically modified so that it cannot replicate, and edited to carry the DNA instructions for human cells to develop the spike protein of the coronavirus. If people aren't sure that the vaccine they're receiving is exactly the same that was studied in trials, then "I can imagine that some people might have their reservations about getting that vaccine at all," said Rasmussen.Another unknown is whether the manufacturing problem that led to the adenovirus vector being able to replicate also knocks out the DNA code for the spike protein — rendering the shot ineffective as a coronavirus vaccine.
As said here by https://www.cbsnews.com/news/sputnik-v-vaccine-covid-brazil-russian-vaccine-ban-efficacy-recombination/