All 17 people infected with the potentially fatal strain of E. coli bacteria visited Akita Furusato Mura (Akita hometown village) in Yokote city, Japan, during the recent Golden Week holidays, or had family members who visited the park during the same period.

Six of the 17 infected people required hospitalization for diarrhea or severe stomach pain.

The park’s Akachan Dobutsu-en (baby zoo) is a petting zoo with 89 types of animals that attracted approximately 34,000 people during the holiday week.

Golden Week is a national labor holiday that runs from April 27 through May 7.