越南官方表示，河內市、胡志明市、芹苴都已出現Omicron亞型變異株BA.4、BA.5社區病例，籲民眾注射加強針。至於12歲以下兒童第一劑疫苗覆蓋率達6成，第二劑則有近3成。 越通社（VNA）報導 ...
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