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Those "highly effective vaccines" are around 75-80% effective, compare to 90-95% for the best vaccines https://myacare.com/blog/comparison-of-covid-19-vaccines

• DiogenesKynikos 4y ago
  The best numbers for this come from Hong Kong, which uses both Sinovac and Biontech/Pfizer.[0] Three doses of Sinovac are actually marginally more protective for >80-year-olds (97.9% vs 97.5% effectiveness at preventing death), though the difference is probably not statically significant. 0. Study in The Lancet Infectious Diseases: https://doi.org/10.1016/S1473-3099(22)00345-0 https://doi.org/10.1016/S1473-3099(22)00345-0