Photo/Illutration People wearing protective masks to help curb the spread of the coronavirus wait for a traffic light at an intersection on March 1 in Tokyo. (AP Photo)

Tokyo confirmed 237 novel coronavirus infections on March 7, down from 293 the day before and 92 fewer than a week earlier, metropolitan health officials said.

The average per day over the week through March 7 was 254.1, representing 91.6 percent of the number for the preceding week, officials said.

The number of serious COVID-19 cases requiring ventilators or an extracorporeal membrane oxygenation (ECMO) device, which circulates blood through an artificial lung, increased by one from the previous day to 52.

Of the newly confirmed cases, 49 patients were aged 65 or older, the group most vulnerable to developing serious symptoms.

Forty-four new patients were in their 20s, 40 each in their 40s and 50s and 34 in their 30s.