US health officials announce rising cyclospora infections. People consumed tainted iceberg lettuce. The parasite clings on the greens despite washing. Symptoms comprise watery diarrhoea, stomach cramps and exhaustion. Some cases continue weeks. New cases are emerging in various states. The CDC and FDA say throw away any risky lettuce now. Avoid raw salads with iceberg lettuce for now. Restaurants must pull it from menus at once.