Here're some links to vaccination information by the city of Yokohama.
Health and Social Welfare Bureau of the city of Yokohama（横浜市保健所）
Vaccination info page (Chinese versions available from this page):
Guide to Vaccinations for Children
Vaccination medical questionnaire
BCG Vaccination Questionnaire
Multilingual information of Immunization
*Unfortunately, the information in the link above has not been updated for a while (now children can get polio vaccination at local clinics, not at the Health and Social Welfare bureau).