TOKYO — The Japanese capital has confirmed 107 new cases of the coronavirus, the highest since early May, raising concern about a possible resurgence of the disease just as businesses return to normal.

Tokyo Gov. Yuriko Koike, at a meeting with a panel of experts, said the infections are on the rise and extra caution is needed. Koike said many of the cases are linked to nightlife establishments, and urged workers to proactively take virus tests and further safety measures.

She said, “We are now at a stage where we need to use caution against the spread of the infections.”

Norio Ohmagari, director of National Center for Global Health and Medicine Hospital, raised concern about the rise in the number of untraceable cases that could multiply infections in weeks.

Tokyo has asked hospitals to start securing up to 3,000 beds in case infections spread further. Up to 1,000 beds are currently set aside for coronavirus patients, officials said.

Experts say many of the recent infections were linked to younger people in their 20s and 30s who have visited the nightlife district. Experts also say infections are being brought home from workplaces and elsewhere, posing risks for elderly people and others with preexisting conditions.