钟南山最新判断：疫苗半年后效果下降，需及时补种加强针
11月11日晚，以“结伴同行，推动全球城市治理现代化”为主题的全球市长论坛全体大会在广州越秀国际会议中心开幕。
会上，中国工程院院士钟南山作专题演讲，分享了对广州应对疫情经验、Delta变异株感染的特点及预防、新冠病毒的主要预防措施疫苗注射的观点和看法。
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