Treponema pallidum is increasing explosively in Japan！
The infection route is Mainly sexual intercourse. Infection occurs through contact between infected areas and mucous membranes/skin. In addition, prostitution of Japanese women by foreigners visiting Japan.
In Japan, the number of reports has been on the rise since 2010, and the annual cumulative number of reports in 2018 was 6,923, continuing to increase. By age, men in their 20s to 50s and women in their 20s to 40s are on the rise. Since 2009, more than 50% of men were infected through same-sex sexual intercourse, but in 2015 Since then, the rate of infection through heterosexual sex has increased. For women, the majority of infections occur through sexual intercourse. The infection rate when having sex with a syphilis patient who has been infected for less than a year is estimated to be about 30%.