The United Kingdom surpasses 500,000 cases of COVID-19 after a backlog of infections left out of Public Health England's daily figures between September 25 and October 2 led to a record 22,961 cases reported in 24 hours. The glitch led to 15,841 cases not being passed on to data dashboards used for contact tracing.
In Beijing, authorities arrest Xu Zhangrun, a law professor who published essays strongly criticizing Chinese Communist Party general secretary Xi Jinping over censored academia on the COVID-19 pandemic and accusing him of ruling "tyrannically."
A University of Barcelona-led investigation uncovers traces of SARS-CoV-2 in frozen Barcelona sewage samples drawn on 12 March 2019, more than half a year before the first publicly confirmed case of COVID-19 in China.
The death toll from COVID-19 in the U.S. reaches 1,200. The total number of cases in the country is 83,097. The U.S. has surpassed China in number of active cases, making it the country with the most cases in the world.