US health officials report rising cyclospora infections. People ate tainted iceberg lettuce. The parasite remains on the greens regardless of washing. Symptoms comprise watery diarrhoea, stomach cramps and exhaustion. Some cases persist weeks. New cases are appearing in various states. The CDC and FDA say discard any questionable lettuce now. Avoid raw salads with iceberg lettuce for now. Restaurants must take out it from menus at once.