FDA Retracts Key Lettuce Test as Cyclospora Investigation Continues: What We Know, What We Don't Know

United States -- July 20, 2026: The investigation into the nationwide Cyclospora outbreak has taken an unexpected turn after the U.S. Food and Drug Administration (FDA) announced that a laboratory test previously believed to confirm the parasite in shredded iceberg lettuce was actually a false positive.Federal and state health officials continue gathering evidence while trying to determine whether they are dealing with a single nationwide outbreak, multiple unrelated outbreaks, or several contam