To obtain such results, a team of scientists from Yokohama University and other institutions conducted a study of 376 people in their 20s to 70s who were infected with the coronavirus between February and May.
The researchers analyzed blood samples taken six months after these people became infected. The researchers found that 97% of people who were asymptomatic or had mild symptoms, and 100 percent of those with moderate or serious symptoms, had neutralizing antibodies in their systems.
According to scientists, stronger antibodies are usually found in people who were in serious condition.
Meanwhile, a medical study published by US doctors last month found that transmission of the virus from mothers to newborns is rare.