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亚型奥密克戎(Omicron)导致的新冠病毒入院人数激增，加上疫苗无法防止再次感染，促使卫生政策制定者重新思考他们的加强针措施。
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