Если сравнивать страны, то посмотрите на Китай.
https://covid19.who.int/table
При их населении заболевших меньше, чем в Армении. По абсолюту.
Привито 70% в Китае, в Армении 2.2%.
Про Дэльту (
https://www.nature.com/articles/d41586-021-01696-3)
Delta is moderately resistant to vaccines, particularly in people who have received just a single dose. A Public Health England study (
https://www.gov.uk/government/news/v...-after-2-doses ) published on 22 May found that a single dose of either AstraZeneca's or Pfizer's vaccine reduced a person’s risk of developing COVID-19 symptoms caused by the Delta variant by 33%, compared to 50% for the Alpha variant. A second dose of the AstraZeneca vaccine boosted protection against Delta to 60% (compared to 66% against Alpha), while two doses of Pfizer’s jab were 88% effective (compared to 93% against Alpha).
Т.к. Спутник В тоже векторный, как и Пфайзер, то должно быть примерно одинаково.