# FDA's false positive test complicates salad crisis

Role of Taylor Farms lettuce in cyclospora outbreak remains unclear.

- **Source:** [US Top News and Analysis](https://brifing.si/source/635540e9-943e-450d-ae52-ae0bfe3b67eb)
- **Published:** 2026-07-20
- **Topic:** [Business](https://brifing.si/c/business)
- **Original article:** <https://www.cnbc.com/2026/07/20/cyclosporiasis-fda-taylor-farms-lettuce-false-positive.html>
- **On Brifing:** https://brifing.si/s/72263681-a61b-4404-aba5-37d0c74b087d

## False positive test caused confusion

The FDA announced that a test indicating the presence of cyclospora parasite in a lettuce sample supplied by Taylor Farms from Mexico was a false positive. However, this only applies to one specific shipment. The agency maintains that the outbreak sickening over 1,600 people still originated from the same supplier's lettuce.

## Consumer advisory remains in effect

The FDA continues to warn Americans against eating recalled shredded iceberg lettuce. The agency states that traceback investigations and outbreak data still point to lettuce from Taylor Farms facilities in central Mexico. Risky products in supermarkets are reportedly being recalled.

## Restaurant chains affected

The recall of lettuce served at restaurants like Taco Bell has created ripple effects across the industry. According to Placer.ai data, Taco Bell's foot traffic dropped 19% on Friday compared to the weekly average this year. Experts anticipate short-term sales losses but believe long-term impact will be limited.

## Retailers took precautionary measures

Walmart proactively removed 4 packaged salad products supplied by Taylor Farms from stores across 27 states, despite no proven connection to the outbreak. The company announced working closely with the supplier and pulling the products. Consumers remain cautious when purchasing fresh lettuce.

## Parasite spread risk

Dr. Norman Beatty from University of Florida emphasized that cyclospora parasite can have up to 2 weeks incubation period, making testing of different shipments critical due to lettuce's short shelf life. Warnings were issued that the outbreak detected in over 30 states might cause smaller spread in other regions.

## Food safety systems questioned

Former FDA Commissioner Dr. Scott Gottlieb stated the false positive doesn't completely clear Taylor Farms' connection to the outbreak. He noted that initial screening tests not being reproducible in confirmation tests isn't uncommon in foodborne outbreak investigations, but may shake consumer confidence. The incident highlighted the importance of supply chain traceability once again.

## Sources covering this story

- https://www.cnbc.com/2026/07/20/cyclosporiasis-fda-taylor-farms-lettuce-false-positive.html — 

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_Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._