来源：新华社微博 | 2022-02-24 19:29:16 |
国家卫健委2月24日通报，全国新冠疫苗接种剂次超31亿。近日，新冠疫苗序贯加强免疫接种启动。研究数据表明，同源加强免疫和序贯加强免疫，都能够进一步提高免疫效果。专家呼吁满足接种条件的人群主动接种、及早接种。（记者 徐鹏航）
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