The 2026 cyclospora outbreak has produced its first recorded deaths. Michigan’s health department announced on Monday that two people with underlying health conditions had died, and the Centers for Disease Control and Prevention added a notice to its outbreak pages the same day saying it "is aware of two cyclosporiasis-related deaths in people with underlying health conditions from Michigan as part of this outbreak". CDC issued no press release.
The attribution is not as simple as the notice makes it sound. Michigan attributes the deaths to the cyclosporiasis outbreak affecting Michigan — a state investigation whose source its department says has not been identified — rather than to the nine-state outbreak the CDC has been counting, which is linked to shredded iceberg lettuce served at Taco Bell and supplied by Taylor Farms de Mexico. Those are not the same outbreak, and they are not remotely the same size.
Michigan’s own count stands at 11,234 cases and 193 hospitalisations, with illness onsets running from 10 May. The CDC’s outbreak count stands at 1,947 cases and 98 hospitalisations, across nine states, with onsets from 22 June to 20 July. One state is reporting 5.8 times as many cases as the federal outbreak investigation covering nine, and 95 more hospitalisations than the federal figure for all of them. Michigan’s total also exceeds the CDC’s national count of lab-confirmed, domestically-acquired cases since 1 May — 6,707 across 45 states — by 67%.
A fourth number sits on a different system again. The National Notifiable Diseases Surveillance System, which collects case reports from state health departments rather than from any outbreak investigation, records 11,877 cyclosporiasis cases among US residents for the 2026 disease year through the week ending 25 July. Full-year totals in that series are 2,706 for 2022, 4,200 for 2023, 3,625 for 2024 and 3,952 for 2025. This year has already passed the worst complete year by a factor of 2.83, with weeks of the season still to run.
The concentration is extreme on that measure too. Michigan reports 4,843 cases for the year to date in the notifiable-disease system and Ohio 2,905 — 65% of the national total between them. At the equivalent week of 2025 the two states had reported 37 and 30 cases. The weekly national series ran at six cases in the week ending 23 May and 2,275 in the week ending 18 July.
None of these figures can be added to another, and the differences are definitional rather than contradictory: different case definitions, different date windows, different inclusion of probable cases, different geography. Michigan’s statewide number includes probable cases; the CDC’s outbreak number requires both a laboratory confirmation and a reported exposure to one restaurant chain. The Fold made the mistake of treating a state-federal gap as a disagreement in July and corrected it; the rule that came out of that — check whether two counts cover the same population before calling them inconsistent — applies to all four of these.
The notifiable-disease figure is, on its own evidence, an undercount. Of the cases added to the total in the week ending 25 July, 45.5% were assigned to earlier weeks as state reports arrived, and the equivalent 2025 figure was revised upward by 126% after publication. As of Monday afternoon the CDC outbreak page still displayed "Deaths: 0" in its summary block below the notice announcing two, and its investigation page still carried the line "no deaths have been reported" under a 24 July stamp — a publishing lag between a banner and a table that are maintained separately.