Scientists are questioning whether waning immunity to Covid-19 could affect how useful a vaccine will be in tackling the pandemic, even as investors welcomed new positive early trial data.
盡管新公布的有關(guān)新冠疫苗的積極早期試驗(yàn)數(shù)據(jù)受到了投資者歡迎,但科學(xué)家們?nèi)栽谫|(zhì)疑:對新型冠狀病毒肺炎(COVID-19,即2019冠狀病毒病)免疫力的減弱會否影響疫苗在應(yīng)對疫情中的作用?
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