For me, this really calls into question the efficacy numbers published for the Gamaleya vaccine. e.g.: The Gamaleya National Research Center of Epidemiology and Microbiology and the Russian Direct Investment Fund (RDIF) have reported that the Sputnik V Covid-19 vaccine showed a 97.6% efficacy. [0]
[0]: https://www.pharmaceutical-technology.com/news/russia-sputni...