Several U.S. states are facing an outbreak of diarrhea caused by Cyclospora, a parasite that contaminates fresh food or water. Thousands of people, many in the Midwest, have fallen sick with severe diarrhea. On Saturday, the FDA announced that lab tests had confirmed Cyclospora contamination in iceberg lettuce from Mexico. The company Taylor Farms has recalled several lettuce products after health officials linked it to the outbreak. In a press conference Tuesday, Health and Human Services Secretary Robert F. Kennedy Jr. claimed the outbreak was under control.