Four US states are reporting Cyclospora cases tied to salad. More states are at risk of reporting cases. Wisconsin, Minnesota and Ohio are already seeing cases. Illinois is being checked. The parasite causes long bouts of diarrhoea, stomach cramps and tiredness. Officials caution that fresh salads pose a risk. UK shoppers should rinse all bagged leaves thoroughly. Run cool water on each leaf before consumption. Scrub hard leafy vegetables such as cabbage with care. Soap is not needed; just water gets the job done.