Taipei’s education and health agencies opened a joint investigation Wednesday after at least 21 students at Yanping Middle School reported vomiting and diarrhea, with some parents saying children required hospital care overnight.

Mayor Chiang Wan-an told reporters the city could not yet determine whether contaminated food or a norovirus cluster caused the illnesses. The education department sent staff to the campus to check on students, while the health bureau collected retained lunch samples for laboratory testing.

Parents raise alarm on social media

Political commentator Chou Hsuan drew attention to the case in a morning social media post, saying families had counted 21 affected students across grades. Chiang did not dispute the scale in his remarks but cautioned that epidemiologists had not finished their work.

Yanping Middle School is a private campus in Taipei. City officials did not order a full shutdown by midday Wednesday, though principals were told to isolate symptomatic students and notify the health bureau of new cases.

Norovirus versus food poisoning

Norovirus spreads quickly in classrooms and dormitories through contaminated surfaces and close contact. Foodborne outbreaks, by contrast, often trace to a single meal service. Chiang said Taipei would wait for stool tests and food-sample results before classifying the event.

Taiwan’s Centers for Disease Control typically urges schools to extend cleaning protocols and pause shared buffet lines when gastroenteritis clusters appear. The city did not announce citywide school closures, treating Yanping as an isolated probe unless additional campuses report linked cases.

Parents interviewed by cable news said they wanted transparency on which cafeteria vendor supplied Tuesday’s lunches. The education department did not release vendor contracts before publication. Chiang pledged that findings would be disclosed once laboratories returned results, adding that hospitalized students were receiving supportive care.

For Taipei’s government, the outbreak lands during a week of high-profile public-health appearances, including Chiang’s visit to a methadone maintenance clinic elsewhere in the city. Officials will be judged on how quickly they trace the source and whether communication with Yanping families stays ahead of social media rumors.

What schools are told to do next

The health bureau reminded campuses to keep sick students home for at least 48 hours after symptoms end, a standard norovirus precaution. Custodial staff were instructed to disinfect high-touch surfaces such as door handles, cafeteria trays and restroom fixtures with bleach solutions approved for institutional use.

Private schools in Taipei contract meal vendors through competitive bidding, and outbreaks often trigger contract reviews even when laboratories eventually blame person-to-person spread rather than a bad batch. Yanping administrators declined interview requests Wednesday afternoon, referring questions to the city education department’s press office.

Legislators from opposition parties said they would ask the city council’s education committee to summon health officials if test results slip past the weekend. Chiang said he would not speculate on penalties until investigators complete their report, but he emphasized that any vendor found negligent would face consequences under existing procurement rules.