Changes and distribution of antibodies in plasma before and after infection of SARS-CoV-2 Omicron strain oleh Zhijun ZHOU, Shenglan YUE, Yan PENG, Jun LIU, Yunfen WU, Kun DENG, Yun ZHANG, Juan LI, Kejin CHEN, Cesheng LI, Shuangying ZENG, Yong HU, Jin ZHANG