Heilongjiang traces all 13 cases to one transmission chain
26 January 2022. All the 13 locally transmitted positive cases of COVID-19 reported on Tuesday in the cities of Suifenhe and Dongning in Heilongjiang province were preliminarily identified in the same transmission chain.https://www.chinadaily.com.cn/a/202201/26/WS61f0ca5ca310cdd39bc83615.html