At present, the new coronavirus infection has not been recognized as an epidemic in Japan. (Ministry of Health, Labour and Welfare)
Since February 1st, foreign nationals who have been to Hubei Province in China in the past 14 days or those holding passports issued in Hubei Province are unable to enter Japan. (Ministry of Justice Immigration Services Agency)
In Japan, preventative measures such as hand-washing and gargling to prevent infection, the enforcement of coughing etiquette, and wearing a mask with cold-like symptoms are currently becoming more prevalent.
Additionally, tourist facilities are striving to prevent influenza and other viral infections by placing alcohol hand sanitizer at entrances and exits.
If, by any chance, you are suspected to be infected while in Japan, the Ministry of Land, Infrastructure, Transport and Tourism's Japan Tourism Agency has a Japan Visitor Hotline which works to ensure the health of foreign tourists and prevent the spread of infection by directing those who may be infected to a specific medical institution to receive early medical consultations, etc.
The Hotline is available 24 hours a day, 365 days a year, and in four languages (Japanese, English, Chinese and Korean).