The recent resurgence of COVID-19, which has hit 11 provincial regions and has led to at least 106 infections in 13 tour groups, is believed to have been caused by an imported case, health officials revealed on Sunday.

"Most cases reported in the recent wave were caused by the Delta variant and related to tourism.

The origin of the virus is still under investigation," said Wu Liangyou, deputy director of the National Health Commission's disease prevention and control bureau.

"The latest resurgence developed fast, with a growing number of cases not related to the tour groups," Wu added.

国家卫生健康委疾控局副局长吴良有在10月24日召开的新闻发布会上介绍，本次疫情是由一起新的境外输入源头引起，已波及11个省份，造成至少106例感染，涉及13个旅行团或自驾游。

吴良有还介绍，本起疫情的病毒为德尔塔变异株，目前发现的跨地区感染者绝大多数与旅游团或自驾的游客有关。

疫情源头尚在流调溯源中。

总体上看，目前疫情处于快速发展阶段，非旅行团的病例数量开始增加。

He estimated cases will continue to grow in the next few days and spread to more areas.

预计未来几天发现病例数将继续增加，疫情波及范围可能进一步扩大。

【我国本轮疫情源头来自境外查看网站：[db:时间]】