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FDA says Taylor Farms cyclospora finding was a false positive, investigation continues
Summary by The San Francisco Editorial Desk · Based on reporting by Alexis Garcia , NBC Bay Area (KNTV, NBC)
· July 19, 2026
· 3 min read
A sample of lettuce from Taylor Farms that initially tested positive for cyclospora, the parasite linked to a growing “explosive diarrhea” outbreak, was later determined to be a false positive, the Food and Drug Administration said on Sunday. The FDA said laboratory experts re-reviewed the test r...
Story provenance No corrections
Summary created by The San Francisco Editorial Desk — automated, rule-governed Original reporting Alexis Garcia, NBC Bay Area (KNTV, NBC) Original story Read at the source Source published Jul 19, 2026 Indexed here Jul 21, 2026 AI assistance Automated summary drawn from the source’s own published text Prepublication human review No — editorial rules, flagged-item review, and published samples
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Key takeaway The FDA said laboratory experts re-reviewed the test results and concluded the finding “does not represent true amplification and should be considered a false positive.
Why this matters in The San Francisco
The false positive finding of cyclospora in Taylor Farms lettuce has significant implications for San Francisco's food supply and public health. As a major hub for food distribution and consumption, the city's residents and businesses are closely watching the outbreak and recall efforts. The initial positive test result led to a voluntary recall of iceberg lettuce sourced from central Mexico, which was distributed to multiple states, including those with major metropolitan areas like Texas and Illinois. Although the recall remains in effect, the FDA's correction of the test result may alleviate some concerns about the safety of the food supply in San Francisco and the surrounding Bay Area. However, the ongoing investigation and outbreak underscore the need for continued vigilance and cooperation between food suppliers, regulators, and public health officials to protect consumers and prevent further illnesses.
About this story
Original reporting by NBC Bay Area (KNTV, NBC) . The San Francisco surfaces reporting from trusted publishers and adds local editorial context so readers can quickly understand what a story means for their community. We attribute every source, link to the original report, and follow a documented editorial standards policy. To understand how stories are selected and reviewed, read our about page .
For the complete original report, visit NBC Bay Area (KNTV, NBC) . Have a tip or correction? Contact our newsroom .
Category: local ·
Published: July 19, 2026 ·
Source: NBC Bay Area (KNTV, NBC) ·
Reading time: 3 min
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Frequently asked about this story
What is this story about? A sample of lettuce from Taylor Farms that initially tested positive for cyclospora, the parasite linked to a growing “explosive diarrhea” outbreak, was later determined to be a false positive, the Food and Drug Administration said on Sunday. The FDA said laboratory experts re-reviewed the test r...
When was this published? This article was first published on July 19, 2026 by NBC Bay Area (KNTV, NBC) and curated for The San Francisco readers.
Who reported this story? This story was reported by Alexis Garcia at NBC Bay Area (KNTV, NBC). To learn more about how The San Francisco selects and reviews stories, see our editorial standards .
Where can I find related coverage? See more local coverage from The San Francisco, or browse our daily briefing and topic hubs .
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