Outbreaks of infectious intestinal disease are common in schools and nurseries in England and Wales. The main culprits are salmonellas, Shigella sonnei, and small round structured viruses. These diseases are usually spread from person to person or through contaminated food. On average, 30% of people in these outbreaks get sick, and the outbreaks can last around 10 days. Some cases are severe enough to require hospitalization. To prevent these outbreaks, it's important to have good infection control measures in place and to train staff properly. Local surveillance systems can help identify outbreaks early and stop them from spreading.