Sen. Elizabeth Warren accused President Trump and Health Secretary Robert F. Kennedy Jr. of weakening cyclospora surveillance after staff cuts, as prediction markets sharply raised the odds that U.S. cases will top 5,000 by July 31. The CDC has reported 4,173 domestically acquired cases since May 1, with 308 hospitalizations and more than 7,400 suspected infections under investigation. Investigators have linked the outbreak to shredded iceberg lettuce from Taylor Farms in Mexico, though an initial positive lettuce test was later deemed a false positive. Health officials say the CDC lab handling the response "was not impacted" and that a robust response is underway.
Warren Blames Trump, RFK Jr. as Prediction Markets Forecast Cyclospora Surge; Polymarket Sees 89% Chance Cases Top 5,000 by July 31
Elizabeth Warren Attacks Trump, Kennedy Jr. for Failing to Contain Cyclospora Outbreak: Prediction Market Bettors See Cases Rising by July End (UPDATED)
Editor’s note: This story was updated to include a statement from the Health Department.
Senator Elizabeth Warren (D–Mass.) on Thursday blamed the Trump administration and Health Secretary Robert F. Kennedy Jr. for weakening national surveillance of cyclospora, after prediction markets sharply raised the odds that U.S. case counts will climb in the coming weeks.
Market Signals: Polymarket, a prediction platform built on the Polygon blockchain, currently assigns an 89% probability that confirmed U.S. cyclospora infections will exceed 5,000 by July 31 — up from about 55% a week earlier. A separate market on Kalshi places roughly a 60% probability that total cases will surpass 16,000 by the end of the year. Kalshi has an existing data collaboration with Benzinga.
Federal Case Data: The Centers for Disease Control and Prevention (CDC) has reported 4,173 domestically acquired cyclosporiasis cases since May 1 and 308 hospitalizations across 41 states. More than 7,400 additional suspected infections remain under investigation and await laboratory confirmation.
Warren pointed to a reduction in the federal team responsible for detecting parasitic outbreaks — a group that CNN reported fell from 11 staffers to 3 in September — saying the cuts reduced the government’s ability to track and investigate outbreaks.
“We should be investing in public health — not gutting it,” Warren wrote, posting a screenshot of her tweet criticizing the administration’s staffing changes.
A Health Department spokesperson told Benzinga that the CDC laboratory overseeing the Cyclospora response "was not impacted" by workforce reductions and that the administration has mounted a "robust response" to the outbreak.
Source and Investigations: Public-health investigators have linked the cluster to shredded iceberg lettuce supplied by Taylor Farms in Mexico. An initial lab test on a lettuce sample appeared positive but was later determined to be a false positive, officials said. Authorities continue tracing supply chains and conducting laboratory testing to confirm additional cases and potential sources.
About Cyclosporiasis: Cyclosporiasis is an intestinal illness caused by the Cyclospora parasite and is typically transmitted through contaminated food or water. The CDC notes that infections are seasonal, peaking from May through August; the U.S. recorded about 2,700 cases last year.
Robert F. Kennedy Jr. said earlier this week that the outbreak was "under control" and denied that staffing cuts weakened surveillance, adding that response efforts remain ongoing.
Context and Concerns: Prediction markets have drawn scrutiny in past episodes for allowing wagers on outcomes that involve human illness or harm. The current market pricing, coupled with federal case counts and ongoing investigations, has intensified public and political scrutiny of the outbreak response and supply-chain tracing efforts.
Health authorities continue laboratory testing and case investigations; the CDC posts updates on total cases and contamination investigations as they become available.
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