On May 17, the Central Epidemic Command Center (CECC) announced that in consideration rate of the risk of developing serious complications or death following COVID-19 infection among elderly people aged 65 and older, it has revised the definition of a confirmed case of COVID-19, effective from May 18, to include: an individual aged 65 or older, whether under home isolation/quarantine or self-initiated epidemic prevention, who tests positive for COVID-19 with an at-home rapid antigen test kit and whose test result is confirmed by a medical professional or who tests positive with a rapid antigen test performed by a medical professional.