Influenza is usually prevalent from December to March. The number of patients per medical institution for the week ending May 12 was "3.5" It is the first time since 28 years ago that the number of.
patients exceeded "1", which is a guideline for an epidemic in late May. Schools across the country have been closed one after another due to seasonal influenza outbreaks. The Ministry of Health, Labour and Welfare says, "As socio-economic activities return to normal, seasonal factors are expected to cause certain epidemics"