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提高防疫工作的有效性，核酸检测如何做到“既不层层加码，也不随意减码”？部分地区出现聚集性疫情，如何落实分级分类诊疗？有序推进新冠病毒疫苗接种有何新进展？针对公众关注的热点问题，国务院联防联控机制有关专家作出权威回应。
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