英国:疫苗加强针可将50岁以上的人对因Omicron感染而死亡的保护率提高到95%
英国卫生安全机构(UKHSA)周四表示,在50岁或50岁以上的人群中,新冠疫苗的加强针可将对因Omicron变种感染而死亡的保护提高到95%。
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英国卫生安全机构(UKHSA)周四表示,在50岁或50岁以上的人群中,新冠疫苗的加强针可将对因Omicron变种感染而死亡的保护提高到95%。
UKHSA表示,在第二次接种任何一种COVID-19疫苗约6个月后,50岁及以上的人群感染Omicron变种的死亡的预防作用约为60%。然而,在接受强化疫苗剂量两周后,这一比例可提高到95%左右。
UKHSA补充说,数据还显示,疫苗加强针对住院也具有很强的预防作用。辉瑞/生物技术疫苗的住院预防有效性约为90%,不过在接受加强针10-14周后这种预防作用将会下降至75%。
对于Moderna疫苗,在接种加强针后9周内,预防住院的有效性为90-95%。
UKHSA还发布了一份针对被称为BA.2的Omicron亚型变种的疫苗有效性的初步分析,分析发现疫苗对症状性疾病的保护水平相似。
UKHSA说:“在25周以上的时间里,两剂疫苗的有效性之于BA.1和BA.2,分别为9%和13%。”“接种疫苗加强针两周后,对BA.1和BA.2的这一比例可分别增加到63%和70%。”
来源:REUTERS;编译:POLARZONE
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