Tokyo officials say they've confirmed 165 new coronavirus infections on Wednesday.

Tokyo had reported more than 200 new cases for four straight days through Sunday.

The governor of the southern Japanese prefecture of Okinawa has asked the country's defense minister to urge US troops stationed there to promptly provide information on coronavirus infections.

A number of US military-affiliated personnel have tested positive for the coronavirus, including those at the US Marine Corps Futenma Air Station and Camp Hansen.

An advisory panel of experts to Japan's health ministry warns that coronavirus infections are continuing to spread throughout the country.

In a meeting on Tuesday, the 15-member panel said the case count is increasing among older people in Tokyo, and some cases outside the capital may have been caused by people who traveled to and from Tokyo.

Japan's health ministry says a study has found that coronavirus antibodies have the ability to prevent infections.

The ministry tested nearly 8,000 people in June, and analyzed their blood samples for the presence of certain proteins that indicate a past infection.

The organizer of a stage production in Tokyo says 37 people, including actors and members of the audience, have been confirmed to be infected with the coronavirus.

The play ran between June 30 and July 5 at Theater Moliere in Shinjuku Ward.

The Tokyo metropolitan government says it confirmed 57 new cases of the coronavirus infections on Saturday in the Japanese capital.

The figure is the highest single-day count since the state of emergency was lifted on May 25. Saturday also marked the second straight day that the daily number in the capital has topped 50.

Japan reported 176 new coronavirus cases and 20 deaths on Monday.

The country's total number of cases is now 15,253. The tally includes people tested at airport quarantine stations, health ministry officials, quarantine officers and individuals who returned to Japan from China on government-chartered planes. It also includes infections among the crew of the Costa Atlantica cruise ship docked in Nagasaki, western Japan.

The number of confirmed coronavirus cases in Japan increased to 15,077 on Sunday as 200 new cases were announced nationwide.

The tally includes people tested at airport quarantine stations, health ministry officials, quarantine officers and individuals who returned to Japan from China on government-chartered planes. It also includes infections among the crew of the Costa Atlantica cruise ship docked in Nagasaki, western Japan.

There were 165 confirmed cases of coronavirus infection reported in Tokyo on Friday. It was the first time in three days that the figure topped 100.

Fewer than 50 new infections were reported on Wednesday and Thursday.

The number of confirmed coronavirus cases in Japan increased to 13,895 on Tuesday as 282 new cases were announced nationwide.

The tally includes people tested at airport quarantine stations, health ministry officials, quarantine officers and individuals who returned to Japan from China on government-chartered planes. It also includes infections among the crew of the Costa Atlantica cruise ship docked in Nagasaki, western Japan.

The number of confirmed coronavirus cases in Japan increased to 13,613 on Monday as 172 new cases were reported nationwide.

The tally includes people tested at airport quarantine stations, health ministry officials, quarantine officers and individuals who returned to Japan from China on government-chartered planes. It also includes infections among the crew of the Costa Atlantica cruise ship docked at a port in Nagasaki, western Japan.

An NHK survey has found that nearly 10 percent of people infected with the coronavirus in Japan are believed to have contracted the pathogen inside hospitals and other medical institutions.

As of Tuesday, the total of confirmed and suspected cases of hospital infections stood at 1,086, across 60 medical institutions nationwide.

Officials in Nagasaki, western Japan, have confirmed 43 more coronavirus infections among the crew of a cruise ship docked at a port in the prefecture. The total number of cases on the vessel has reached 91.

Tests are being carried out on all 623 crew members of the Italian-registered Costa Atlantica. The ship was sent to a Mitsubishi Heavy Industries shipyard for repairs.

The number of confirmed coronavirus cases in Japan stood at 12,023 on Thursday.

The tally includes people tested at airport quarantine stations, health ministry officials, quarantine officers and individuals who returned to Japan from China on government-chartered planes.