The number of Covid-19 cases in Nanjing in the eastern Chinese province of Jiangsu has risen rapidly over the past week, with daily infections reaching the highest in China since February.

   Jiangsu had 39 cases on Monday and a further 31 cases on Tuesday, bringing the total case number in the cluster to 106, with six asymptomatic infections. Most cases in the cluster are Delta variant infections.

   The Jiangsu cluster is the second most serious outbreak in China since February, following 170 cases recorded in Guangdong in June.