National Institute of infectious diseases announced that the number of patient of measles reached 185 by September 8, 2017. Compare to last year, 185 people who was infected measles that is 26 people more than last year. Compare to each prefecture, 53 people are infected by measles in Yamagata that is the worst number in Japan so far. 28 people are infected in Tokyo that is the next, then Mie, 22 people are infected, is the third largest number. Measles is airborne infection virus and very strong in an infection power. People are easy to be infected measles by the a patient. Incubation period is from 10 to 12days. During that period, people may be in serious condition and may result in death if symptoms of Pneumonia and encephalitis shows.