來源：新華社微博 | 2022-02-24 19:29:16 |
國家衛(wèi)健委2月24日通報，全國新冠疫苗接種劑次超31億。近日，新冠疫苗序貫加強(qiáng)免疫接種啟動。研究數(shù)據(jù)表明，同源加強(qiáng)免疫和序貫加強(qiáng)免疫，都能夠進(jìn)一步提高免疫效果。專家呼吁滿足接種條件的人群主動接種、及早接種。（記者 徐鵬航）
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