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新冠肺炎疫情扩散，上海市政府周六下午举行疫情新闻发布会，会上首度证实新冠病毒可以通过气溶胶传播，即带病毒的飞沫混合在空气中形成气溶胶，稳定地悬浮于空气中，人吸入病毒气溶胶便有可能受感染。

新闻发布会上指，上海最近发生一部分家庭聚集性的病例，强调需进一步加强家庭内部的防疫。会上提出，目前可确定的新冠病毒肺炎传播途径主要为直接传播、气溶胶传播及接触传播。

会上重申，防止疫情蔓延需取消一切社会活动聚集，劝阻重点疫区亲友延迟访沪，家中保持空气流通，注意个人卫生，做好日常家庭消毒；外来返沪人员需配合调查、主动接受隔离，避免接触可疑症状者身体分泌物，就餐时，公筷分餐，快进食，少说话，避免握手及拥抱。

另外，上海市疾控中心消毒与感染控制科主任朱仁义会上表示，上海即将迎来春节返程高峰，市政府将在机场、火车站增设检疫关口，所有外地入沪的旅客需配合测量体温及填写申报表。同时，上海将即日起严格执行公共场所体温检测及佩戴口罩的措施，直至解除重大突发公共卫生事件一级响应机制为止。

何为气溶胶？英语为Aerosol，又称气胶、烟雾质，是指固体或液体微粒悬浮于空气介质中所形成的分散体系，其中的颗粒物质则被称作悬浮粒子。