Pfizer and BioNTech have enrolled the first participants in a clinical trial of a vaccine tailored to the Omicron coronavirus variant as the companies weigh whether they need to replace their existing Covid-19 jab.
辉瑞(Pfizer)和BioNTech为专门针对新冠病毒Omicron变种的疫苗的临床试验招募了第一批参与者。两家公司正在权衡是否需要更换其现有的新型冠状病毒肺炎(COVID-19,即2019冠状病毒病)疫苗。
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