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kyha123 wrote:
之前不是有人一直说巴西感染率不降 说明中国疫苗无效 现在美国出现同样情况 怎么不见发帖了
說這些話都要有打過和沒打過對比才有意義,這是最新的real world數據,不曉得中國疫苗有沒有類似的數據
‘Real world’ study by CDC shows Pfizer and Moderna vaccines were 90% effective
The study was released Monday in Morbidity and Mortality Weekly Report, an online journal published by the Centers for Disease Control and Prevention.
The study followed nearly 4,000 health care workers, first responders, and other essential workers in eight U.S. locations as the first Covid vaccines were rolled out starting in December. Participants were tested weekly to look for all cases of Covid infection, even asymptomatic ones.
There were 161 Covid infections in the unvaccinated workers, compared with 16 in workers who had received only one dose by the time of their infection and only three infections in people who had received both doses and were two weeks out from their second dose. The vaccine effectiveness following two doses was 90% — roughly in line with the 95% and 94% that the Pfizer and Moderna vaccines showed, respectively, in the clinical trials that supported their emergency use authorizations.
