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A sample of lettuce from Taylor Farms that had tested positive for cyclospora was a false positive, the Food and Drug Administration said Sunday. "Due to the complexity in detection of Cyclospora, FDA laboratory experts re-reviewed the sample results and have concluded that the finding does not represent true amplification and should be considered a false positive," the FDA said. (Freiman, 7/20)

Taylor Farms has recalled iceberg lettuce distributed in 27 states, sharply expanding the scope of a cyclospora outbreak initially linked to shredded lettuce served at Taco Bell restaurants in five Midwestern states. The Salinas company said the recalled lettuce was sourced from central Mexico and distributed from June 29 through Thursday. Products have “best if used by” dates extending through Aug. 3. (Vaziri, 7/18)

Cases of parasitic diarrhea are spiking in Missouri. More than 200 positive cases of cyclosporiasis, caused by a parasite linked so far largely to lettuce, have now been reported to Missouri state health officials, according to case counts released Sunday. (Bauman, 7/19)

For weeks, Sherry Dommer has been living a gastrointestinal nightmare. Violent cramps. Exhaustion. Unrelenting nausea. Sprints to the toilet at all hours of the night. Ms. Dommer, 49, has long considered herself a “go-go-go person,” but certainly not in this sense. (Bogel-Burroughs, 7/19)

The leading suspect, it seemed, was the cilantro. Weeks before an outbreak of cyclosporiasis, now traced at least in part to iceberg lettuce, laid low thousands of Americans this summer, the New York City Health Department investigated a smaller outbreak. Testing labs and doctors notified the city that people were coming down with the intestinal illness, which is caused by a parasite and can result in explosive diarrhea and other types of gastric distress. (Newman, 7/19)