Why is lettuce so often linked to foodborne illness?

Health & FitnessFood
28 Jul 2026 • 2:14 AM MYT
The Independent
The Independent

The world’s most free-thinking newspaper

Why is lettuce so often linked to foodborne illness?

  • Contaminated lettuce is linked to the largest U.S. cyclosporiasis outbreak this year, an illness causing severe gastrointestinal symptoms.
  • Lettuce has been a frequent source of foodborne illnesses, including past outbreaks of cyclosporiasis, E. coli and Salmonella.
  • Factors contributing to lettuce contamination include high consumption, difficulty in washing, growth close to the soil and irrigation with contaminated water.
  • Pre-washed lettuce does not guarantee safety, and cooking produce to 158 degrees Fahrenheit is the only way to kill the cyclosporiasis parasite.
  • Other raw produce like parsley and cilantro also pose similar risks due to their growth conditions and consumption methods, leading experts to caution against the dangers of contaminated food.

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