据巴西媒体报道,圣保罗大学研究显示,医院员工接种科兴疫苗后确诊比例较未接种者低50.7%至73.8%。另一项在亚马逊州的研究显示,这种疫苗对巴西变种病毒株P.1有50%的免疫效用。
根据研究,今年1月第3周,圣保罗大学医学院附设综合诊所医院开始为员工接种疫苗时,有51名员工确诊,3月最后1周完成疫苗接种后,有46名员工确诊。如果医院的感染情况和同期圣保罗市的趋势相同,3月最后1周的员工确诊人数应达175人。
结果显示,在医院员工集体接种疫苗前,医院的新冠病毒感染率和圣保罗市民众一样,但第2剂疫苗接种2周后,医院员工染疫有症状的确诊病例较圣保罗市的新增病例平均减少50.7%。
研究显示,第2剂疫苗接种5周后,医院员工新增病例较圣保罗的民众减少73.8%。
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