Majority of state's cyclosporiasis in NWA

Zoom out: The CDC last week reported 4,173 confirmed cases in the U.S. between May 1 and July 20. That's already more than the total number of U.S. cases reported for all of 2025.

• Investigations continue to center on contaminated iceberg lettuce as a source for the outbreak.

The big picture: Although some cases of the illness are reported each year, the outbreak will make 2026 the worst year on U.S. record for this foodborne parasitic infection.

Zoom in: Michigan has by far the highest number of lab-confirmed domestic cases: between 900 and 2,100.

Between the lines: The CDC also notes that it's aware of at least 7,400 cases — many from Michigan and Ohio — that have not yet been lab-confirmed.

• And some people who get sick never get tested for cyclosporiasis.

What we're watching: Whether case numbers keep rising in the coming weeks, even as mitigation around potential contaminants continues, because there's a lag between illness onset and reported cases.

The bottom line: Case totals will likely get worse before they get better.