Lancet Respir Med:流感疫苗接种后效力研究

2018-11-13 zhangfan MedSci原创

研究发现,流感疫苗接种9个月后疫苗的效力下降,为达到更好的预防效果每年均需要接种疫苗

一般而言,每年易感人群都需要补种流感疫苗,但当年新接种疫苗后,疫苗效力下降的速度尚不清楚,特别是对于流感高发地区和易感人群,单次接种后的保护时效就尤为重要。近日研究人员就流感疫苗注射后对流感住院的预防效果进行了研究。

6个月-17岁的儿童参与本次研究,其在2012-17年间因流感住院,存在发烧(≥38°C)和呼吸道症状(如流鼻涕、咳嗽或喉咙痛),根据是否接种过疫苗对患者分层,统计疫苗接种和入院时间以检验疫苗的效果。

15695名呼吸道感染患儿中,2500人(15.9%)为流感A或B型感染者,13195人(84.1%)未感染。6.4%的感染人群以及11.0%的未感染人群接种了疫苗。每年的1-3月为流感高发期,统计发现9-12月接种后疫苗的有效率为79%,1-4月接种为67%,而5-8月接种的有效率仅为43%。在接种后0.5-2个月内,疫苗对流感A或B病毒的预防效果为79%,超过2-4个月下降为60%,超过4-6个月为57%,超过6-9个月为45%,疫苗接种后每个月的预防能力下降2-5%。

研究发现,流感疫苗接种9个月后疫苗的效力下降,为达到更好的预防效果每年均需要接种疫苗。

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    2019-05-30 howi
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    2018-11-15 hb2008ye
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    2018-11-13 1dd8a7c5m95(暂无匿称)

    认真学习,不断进步,把经验分享给同好。点赞了!

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