Classical swine fever in Japan : past and current situations.
In September 2018, classical swine fever (CSF) occurred in a pig farm in Japan for the first time in 26 years. Outbreaks unfortunately still continued at pig farms, and the epidemic has expanded to several prefectures. Furthermore, wild boar involvement has made is difficult to control inhibitory the spread of CSF. Most of the CSF that occurred in Japan in the past showed the acute virulent type, but the current CSF in Japan is the so-called "mild type", which has already known worldwide. The current CSF that emerged while "diversification of CSF" has begun to be recognized internationally is different from the CSF that Japan had experienced in the past.