Photo/Illutration Hospital staff care for a COVID-19 patient with serious symptoms at Showa University Hospital on Jan. 7 in Tokyo's Shinagawa Ward. (Provided by Showa University Hospital)

Tokyo reported 307 new COVID-19 infections on Feb. 12, staying under 500 new cases for the sixth straight day, metropolitan officials said.

The capital's seven-day daily case average over the week through Feb. 12 was 426.9 cases, down 31.1 percent from the preceding week.

Many of the new cases, 80, were people 65 or older, followed by 49 people in their 40s and 48 in their 30s. Forty-four people in their 20s and 36 in their 50s also tested positive for the virus.

Tokyo's number of serious cases stood at 102, down one from the previous day.

Tokyo defines serious cases as patients requiring ventilators or an extracorporeal membrane oxygenation (ECMO) device, which circulates blood through an artificial lung.