Photo/Illutration East Japan Railway Co. staff members display signs notifying commuters on Jan. 19 that last train runs from Tokyo's JR Shinjuku Station will depart earlier from the following day. (Yuta Ichijo)

Tokyo reported 633 fresh cases of COVID-19 on Jan. 31, the third consecutive day for the daily count to remain below 1,000.

Of the new cases, metropolitan government health officials said patients in their 20s formed the largest group, with 122. They were followed by 93 patients in their 40s, 89 in their 50s and 76 in their 30s.

The novel coronavirus virus is also continuing to spread among the elderly, who are at high risk of developing serious symptoms. Officials said 77 patients in their 70s fell into this category, while the figure for those in their 80s stood at 62.

Serious cases fell by one from the previous day to 140.

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

As of Jan. 29, the nationwide total of serious cases stood at 974, down 40 from the day before.

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