Foodborne Pathogens: Videos & Practice Problems

Hepatitis A is the most likely in this rapid cluster and the immediate preventive policy should be to vaccinate all children the next day, with no need for hand hygiene or exclusion policies.

The best policy is to continue normal operations because short outbreaks of vomiting in schools are self-limited and do not require changes in hygiene or exclusion practices.

Norovirus and Staphylococcus aureus are both plausible (norovirus due to contagion and 12–48 hour onset; S. aureus possible with food-handler contamination and rapid vomiting). Implement strict exclusion policies for symptomatic food handlers and students, reinforce hand hygiene for staff and children, and ensure symptomatic individuals do not prepare food until cleared — plus consider surface disinfection protocols.

Clostridium botulinum should be suspected and the school should immediately freeze all snacks to prevent toxin formation rather than exclude ill individuals or emphasize handwashing.