Yamaguchi Prefecture announced that it was the first in the prefecture to be infected with a mutated coronavirus.
Infection with the mutant virus was confirmed in one person living in the prefecture, and it was revealed as a result of detailed examination of the specimens of people who had already been confirmed to be infected.
He had no history of staying abroad, and no other person was confirmed to be infected by a survey of contacts.
Yamaguchi Prefecture will send the sample to the National Institute of Infectious Diseases to determine the type of mutant virus.