‘Dynamic zero-COVID’ policy and viral clearance during an omicron wave in Tianjin, China: a city-wide retrospective observational study by Qi Wu, Yan Xie, Tao Cheng, Junping Wu, Wentao Jiang, Lixia Shi, Xiaolong Liu, Yu Hu, Yahui Feng, Hongxia Shao, Xiaowen Gong, Zhen Song, Saibing Qi, Xueou Liu, Qiujin Shen, Junren Chen

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