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 results showed that coronavirus antibodies were found in 0.1 percent of the people tested in Tokyo, 0.17 percent in Osaka, and 0.03 percent in Miyagi Prefecture.
The National Institute of Infectious Diseases examined the antibodies and confirmed for the first time in Japan that antibodies have the ability called "neutralizing" to prevent infections of coronavirus.
The researchers plan to conduct further study, including how long the ability lasts in the human body.