微信早于12月屏蔽疫情消息 "习近平"成敏感词 (Citizen Lab report: WeChat censors words, including “Xi Jinping,” related to the COVID-19 outbreak since December 2019)
Deutsche Welle, March 4, 2020
Related:
How Information on the Coronavirus is Managed on Chinese Social Media
The Citizen Lab, March 3, 2020