Japan has reported 236 cases of measles since January this year, an increase of 3.6 times compared to 66 cases in the same period last year, according to the Japanese Institute of Health Security.
The agency said health facilities across Japan confirmed 34 cases from March 30 to April 5.
A total of 100 first cases were recorded until March 8, while the next 100 cases occurred in the four weeks after that.
Japan was declared measles-free by the World Health Organization (WHO) in 2015, but imported cases from foreign visitors and travelers returning from abroad often trigger local outbreaks.
The highly contagious measles virus spreads through airborne droplets, with symptoms such as fever, runny nose, and cough appearing about 10 days after exposure.
In some cases, the infection can cause serious complications such as encephalitis or meningitis.
The measles-rubella vaccine is given in two doses to prevent infection.
In Japan, children receive the first dose at 1 year of age and the second dose the year before entering elementary school.
The highest annual number of measles cases in the last decade reached 744 in 2019, while in 2025 there were 265 cases.
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