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PHILADELPHIA (CBS)- The CDC says more than 500 people in 16 states have been sickened and McDonald’s salads are the likely culprit.

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Officials from the FDA say 24 folks have gone to the hospital from this parasite outbreak.

Delaware, New Jersey, and Pennsylvania are not among the states impacted.

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Last month McDonalds said it had pulled the salad mix suspected of causing the outbreaks.

Symptoms of the illness include diarrhea, vomiting, fever and body aches.

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It can last several days to several months and can be treated with antibiotics.