9 December 2021. Authorities in Yangtze River Delta (China) have activated emergency response systems to combat the latest round of COVID-19 cases found in major cities in the region in the past few days. All patients were diagnosed with mild COVID-19 symptoms caused by the highly transmissible Delta variant.https://www.chinadaily.com.cn/a/202112/09/WS61b147fda310cdd39bc7a35d.html