Covid-19 variants may be less dangerous to vaccinated people and recovered patients than previously thought, according to researchers who found that the human body produces a strong cellular immune response to some of the most worrying new strains.
研究人员称，对已经接种疫苗者和已经康复的患者来说，新型冠状病毒肺炎（COVID-19，即2019冠状病毒病）变种的危险性可能低于预想。他们发现，人体会对某些最令人担忧的新病毒株产生强大的细胞免疫反应。
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