Photo/Illutration Tokyo residents in a simulation of a mass vaccination in Tokyo's Shinagawa Ward on April 28 (Atsuko Kawaguchi) 

Fresh cases of COVID-19 in Tokyo on May 2 reached 879, or 244 more than the previous Sunday, metropolitan health officials said.

The seven-day average of confirmed daily cases over the week through May 2 stood at 833.1, 14.6 percent higher than the figure for the preceding week.

Of the latest cases, patients in their 20s accounted for 233, the highest number for all age groups. They were followed by 162 patients in their 30s, 133 in their 40s and 97 aged 65 or older.

Serious cases, patients requiring ventilators or an extracorporeal membrane oxygenation (ECMO) device, which circulates blood through an artificial lung, stood at 63, the same as the day before.