It may take up to two weeks to achieve "zero-Covid".
A top Chinese official on disease control said that the ongoing Covid-19 outbreak in Shanghai has far exceeded the patient capacity of the local medical system, and it would be very difficult to control the epidemic in a timely manner.
Wu Zunyou, chief medical expert of China Center for Disease Control and Prevention, said for a megacity with over 25 million people, it can take 10 days to two weeks to clear cases by conducting mass testing three or four times, according to comments posted on his personal social media account on Thursday night. The city on Wednesday began another round of testing, see: MNI BRIEF: Top Off'l Urges Shanghai To Adopt Stricter Measures.
Shanghai’s cases surged again on Thursday, with 824 cases confirmed and 20,398 asymptomatic cases. The country as a whole reported 22,561 asymptomatic cases with 1,540 cases confirmed.