Geriatric assistant after covid infection with negative control tests, but persistent cough. How many days do you have to wait to rejoin the covid plant? And with non-Covid patients? Thank you / 提问:在老年科工作的护工新冠转阴后仍然咳嗽。多少天后可回到新冠病区工作?以及回到非新冠病区呢?谢谢。