US health officials report increasing cyclospora infections. People consumed 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 emerging in several states. The CDC and FDA say toss any suspect lettuce now. Stay away from raw salads with iceberg lettuce for now. Restaurants must remove it from menus at once.