学生呕吐腹泻，官方通报！

Group 1 - The core issue reported is an outbreak of norovirus at Binzhou Vocational College, with students experiencing symptoms such as vomiting and diarrhea [1] - As of the latest update, a total of 413 medical visits have been recorded, with 17 students hospitalized, all presenting mild symptoms [1] - A joint working group has been established by the city of Binzhou, involving education, health, and market regulation departments to manage the situation and provide expert guidance [1]