US health officials note more cyclospora infections. People ate unsafe iceberg lettuce. The parasite stays on the greens even after washing. Symptoms cover watery diarrhoea, stomach cramps as well as exhaustion. Some cases persist weeks. New cases are emerging in multiple states. The CDC and FDA say discard any suspect lettuce now. Avoid raw salads with iceberg lettuce for now. Restaurants must pull it from menus immediately.