A surge in Covid-19 hospital admissions driven by the BA.5 subvariant of Omicron, accompanied by the inability of vaccines to prevent reinfection, has prompted health policymakers to rethink their approach to boosters.
由BA.5亞型奧密克戎(Omicron)導(dǎo)致的新冠病毒入院人數(shù)激增，加上疫苗無法防止再次感染，促使衛(wèi)生政策制定者重新思考他們的加強針措施。
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