摘要
Background:Vaccine effectiveness studies have not differentiated the effect of the delta(B.1.617.2)variant and potential waning immunity in observed reductions in effectiveness against SARS-CoV-2 infections.We aimed to evaluate overall and variant-specific effectiveness of BNT162b2(tozinameran,Pfizer-BioNTech)against SARS-CoV-2 infections and COVID-19-related hospital admissions by time since vaccination among members of a large US health-care system.
出处
《四川生理科学杂志》
2021年第8期1408-1408,共1页
Sichuan Journal of Physiological Sciences