Between January and May in 2018, 17 male cases of hepatitis A were reported in Yokohama, Japan. Of these, 14 identified as men who have sex with men. The viral sequence in this outbreak was same as that of the recent European and Taiwanese outbreaks strain.
In early 2018, a hepatitis A virus outbreak occurred mostly among men who have sex with men in Yokohama, and the viral strains matched with those of the international outbreak.
From the *Department of Infectious Disease, Yokohama Municipal Citizen's Hospital; and
†Department of Testing and Research, Yokohama City Institute of Public Health, Hodogaya-ku, Yokohama, Japan
Conflicts of Interest and Source of Funding: None declared.
Correspondence: Yukihiro Yoshimura, Yokohama Municipal Citizen's Hospital, 56 Okazawa-cho, Hodogaya-ku, Yokohama, Japan. E-mail: email@example.com.
Received for publication June 18, 2018, and accepted October 21, 2018.