A major US food safety investigation has taken another turn after federal officials found the parasite Cyclospora in lettuce samples.
The Food and Drug Administration said two samples tested positive as investigators continue examining an outbreak of cyclosporiasis linked to lettuce.
Cyclospora is a microscopic parasite that can cause an intestinal illness known as cyclosporiasis.
Symptoms commonly include watery diarrhea, loss of appetite, stomach cramps, nausea, fatigue and weight loss. Without treatment, symptoms can sometimes continue for weeks.
The latest laboratory findings provide investigators with an important clue, although authorities are continuing their work to determine precisely how contamination occurred and which products or supply chains may be involved.
Foodborne outbreaks can be particularly difficult to trace because fresh produce may pass through several farms, processors and distributors before reaching consumers.
Health officials recommend that anyone experiencing persistent gastrointestinal symptoms contact a medical professional, particularly if symptoms continue for several days.
