| 25 Ağustos 2021, Çarşamba, 01:04 |
Vaccines Prevented Fewer Infections as Delta Emerged, Researchers Find
A study that followed essential workers in six states found that vaccine protection dropped from 91 percent to 66 percent, still “a really high number,” one scientist said.
https://www.nytimes.com/2021/08/24/health/delta-covid-vaccine-infection.html
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