Gone quiet · last update Oct 2, 2026 / United States Centers for Disease Control and Prevention

The 2026 US cyclospora outbreak, the largest on record

Overview · reviewed October 28, 2026

In the summer of 2026 the United States had its largest recorded outbreak of cyclosporiasis, an intestinal illness caused by the parasite Cyclospora cayetanensis that brings "explosive" diarrhea.[1][2] Federal investigators traced it to iceberg lettuce from a Taylor Farms facility in Mexico, which was supplied to Taco Bell among others.[3][4][5] When the Centers for Disease Control and Prevention declared the outbreak over in September, it counted nearly 13,000 cases and more than 500 hospitalizations; Michigan reported the first two deaths.[6][7] In October the Food and Drug Administration said it had found the parasite at the Mexican farm.[8]

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Federal investigators traced it to iceberg lettuce from a Taylor Farms facility in Mexico, which was supplied to Taco Bell among others.[3][4][5] When the Centers for Disease Control and Prevention declared the outbreak over in September, it counted nearly 13,000 cases and more than 500 hospitalizations; Michigan reported the first two deaths.[6][7] In October the Food and Drug Administration said it had found the parasite at the Mexican farm.[8]

Coverage over time

Share of tracked outlets · weekly (UTC)

Week of 2026-06-29 (UTC): 4%, 25 of 569 tracked outlets (2 left, 19 center, 4 right)Week of 2026-07-06 (UTC): 10%, 54 of 560 tracked outlets (11 left, 36 center, 7 right)Week of 2026-07-13 (UTC): 27%, 149 of 559 tracked outlets (36 left, 80 center, 33 right)Week of 2026-07-20 (UTC): 23%, 131 of 562 tracked outlets (34 left, 72 center, 25 right)Week of 2026-07-27 (UTC): 11%, 63 of 561 tracked outlets (15 left, 40 center, 8 right)Week of 2026-08-03 (UTC): 17%, 90 of 537 tracked outlets (23 left, 52 center, 15 right)Week of 2026-08-10 (UTC): 2%, 12 of 545 tracked outlets (3 left, 8 center, 1 right)Week of 2026-08-17 (UTC): 2%, 10 of 464 tracked outlets (0 left, 10 center, 0 right)Week of 2026-08-24 (UTC): 5%, 24 of 466 tracked outlets (5 left, 16 center, 3 right)Week of 2026-08-31 (UTC): 1%, 3 of 475 tracked outlets (1 left, 1 center, 1 right)Week of 2026-09-07 (UTC): 13%, 64 of 480 tracked outlets (16 left, 37 center, 11 right)Week of 2026-09-14 (UTC): no coverage from tracked outletsWeek of 2026-09-21 (UTC): no coverage from tracked outletsWeek of 2026-09-28 (UTC): 3%, 15 of 476 tracked outlets (4 left, 7 center, 4 right)Week of 2026-10-05 (UTC): under 1%, 1 of 479 tracked outlets (0 left, 1 center, 0 right)Week of 2026-10-12 (UTC): no coverage from tracked outletsWeek of 2026-10-19 (UTC): no coverage from tracked outletsWeek of 2026-10-26 (UTC): no coverage from tracked outletsWeek of 2026-11-02 (UTC): no coverage from tracked outletsWeek of 2026-11-09 (UTC): no coverage from tracked outlets, so far

LeftCenterRight

Each bar is the share of the outlets on our Left / Center / Right rating scale that we tracked publishing that week which carried reporting on this story, split by the outlets' ratings.We track more outlets now than in the archive, so a share keeps earlier and later weeks comparable. An outlet counts once a week however much it published, and outlets in one ownership or syndication group count as one on each side they appear on. A rating describes the outlet, not the report. A gap means no such reports were collected that week, not that nothing was reported anywhere. Weeks run Monday to Sunday in UTC, so a report published on a Sunday evening in US Eastern time counts in the next week. 10 more outlets off the scale (not rated, or outside the left-right graphs) also reported; they are not in this chart. See them.

Weekly counts, outlets and reports (13 weeks with coverage)
Outlets on the rating scale that carried this story each week, of the outlets tracked that week, newest first
Week of (UTC)LeftCenterRightOf trackedShareReceipts
Oct 5, 20260101 of 479under 1%
Sep 28, 202647415 of 4763%
Sep 7, 202616371164 of 48013%
Aug 31, 20261113 of 4751%
Aug 24, 2026516324 of 4665%
Aug 17, 2026010010 of 4642%
Aug 10, 202638112 of 5452%
Aug 3, 202623521590 of 53717%
Jul 27, 20261540863 of 56111%
Jul 20, 2026347225131 of 56223%
Jul 13, 2026368033149 of 55927%
Jul 6, 20261136754 of 56010%
Jun 29, 2026219425 of 5694%

Latest coverage

The newest reporting in this story's record.

  1. Oct 2, 2026 · first reported · Headline from ABC 7 San Francisco

    FDA finds potential source of cyclosporiasis outbreak linked to lettuce

Background

By late June 2026, the CDC had counted 145 domestically acquired cyclosporiasis cases across 20 states, reported from May to mid-June.[2][9] Michigan announced an outbreak on July 1 after more than 170 cases in a few southeastern counties, and within two weeks it was reporting 2,640.[10] State data suggested that 2026 was already the worst year on record,[11] and Michigan officials said the illnesses might be tied to salad greens.[11] The FDA said it had been investigating five separate clusters since the parasite season began in May.[12]

Read the full background (2 more paragraphs)

In mid-July the FDA opened an investigation into iceberg lettuce supplied to Taco Bell, which pulled lettuce from some stores,[4] and Taylor Farms said it was removing all iceberg lettuce sourced from Taylor Farms de Mexico.[5] A lettuce sample first reported as positive turned out to be a false positive, but the FDA kept its focus on the supplier.[13] A Texas Army veteran sued Taco Bell, saying a meal in Ohio had put him in the hospital.[14] National case counts more than doubled in a week, to more than 4,100 in 41 states,[15] and about 1 in every 1,000 people in Michigan was infected.[1] Health Secretary Robert F. Kennedy Jr. said the outbreak was "under control,"[3] a claim former FDA commissioner Scott Gottlieb disputed,[16] and an FDA official insisted that "the U.S. food supply is safe."[17]

In early August Michigan reported the first two deaths, both in people with underlying health conditions.[7] Federal officials linked cases in 15 states to iceberg lettuce, out of at least 47 states that had reported cyclospora that year,[18] while other clusters with no identified source kept growing.[19][20] Sen. Elizabeth Warren wrote to Kennedy demanding answers about what she called a "calamitous" response.[21] The outbreak followed cuts to funding for state and local health departments,[22] and the AP reported that US regulators had been conducting fewer inspections of imported produce.[23] The CDC declared the outbreak over in September, and the FDA later reported finding cyclospora at the Mexican farm.[6][8]

Supporting stories (23)
  1. Cyclosporiasis outbreak in Michigan grows to more than 10,000 cases
  2. CDC monitors parasite outbreak that has sickened over 140 people across 17 states
  3. RFK Jr. says cyclosporiasis outbreak 'under control' amid 1,600 cases in 5 states
  4. Cyclospora parasite outbreak linked to Taco Bell lettuce in 5 states, CDC says
  5. Vegetable supplier Taylor Farms to pull some products amid cyclosporiasis outbreak
  6. Health officials declare end to largest cyclospora outbreak in history
  7. Two deaths linked to Cyclosporiasis in Michigan
  8. FDA finds potential source of cyclosporiasis outbreak linked to lettuce
  9. CDC investigates parasite that’s caused cases of ‘explosive’ diarrhea in 18 US states
  10. Cyclosporiasis Michigan outbreak: Cases rise to 5,002 Friday
  11. As cyclospora illnesses surge to a record, Michigan officials eye lettuce as a possible cause
  12. Federal health officials have investigated 5 different clusters of cyclosporiasis cases, FDA says
  13. Lettuce from Taylor Farms still focus of probe into cyclospora outbreak, FDA says
  14. Lawsuit alleges Taco Bell meal in Ohio caused Army veteran's cyclospora infection
  15. Kentucky health officials confirm rise in cyclosporiasis cases
  16. Cyclospora outbreak not under control yet, says former FDA commissioner
  17. Cyclospora boosts fears that deadlier foodborne outbreaks are ahead
  18. Is lettuce safe to eat now? What to know amid cyclospora outbreak
  19. More cases reported in cyclospora outbreak not linked to lettuce: FDA data
  20. Cyclospora outbreaks with no confirmed sources grow: FDA
  21. Sen. Warren demands answers from RFK Jr. over 'calamitous' response to cyclosporiasis outbreak
  22. Potential source of ‘explosive diarrhea’ parasite, cyclosporiasis, ID’d: report
  23. Cyclospora outbreak followed years of declining FDA foreign inspections

The full record

Each date is when an update was first reported.

All 74 recorded updates

October 2026

  1. FDA finds potential source of cyclosporiasis outbreak linked to lettuceHeadline from ABC News · 17 outlets

September 2026

  1. Health officials declare end to largest cyclospora outbreak in historyHeadline from The Hill · 59 outlets
  2. Cyclospora outbreak followed years of declining FDA foreign inspectionsHeadline from NBC Los Angeles · 15 outlets
  3. Cyclosporiasis outbreak exposes a weakened US public health systemHeadline from Casper Star-Tribune · 1 outlet

August 2026

  1. Officials tie cyclospora outbreak involving iceberg lettuce to 3 more statesHeadline from Phl17 · 20 outlets
  2. DOH investigates Hawaii’s 1st locally acquired cyclosporiasis caseHeadline from Honolulu Star-Advertiser · 5 outlets
  3. As US's cyclosporiasis cases surpass 15,000, these are the hardest-hit statesHeadline from The Hill · 10 outlets
  4. Cyclospora outbreaks with no confirmed sources grow: FDAHeadline from Phl17 · 3 outlets
  5. Sen. Warren demands answers from RFK Jr. over 'calamitous' response to cyclosporiasis outbreakHeadline from ABC 7 San Francisco · 2 outlets
  6. Cyclospora spreads through human waste — so how did it get on food?Headline from PBS NewsHour · 5 outlets
  7. Arkansas reports 12 more cyclosporiasis cases, raising year’s total to 275Headline from Arkansas Democrat-Gazette · 4 outlets
  8. Is lettuce safe to eat now? What to know amid cyclospora outbreakHeadline from Union Leader · 46 outlets
  9. ADH: Illness causing 'explosive' diarrhea continues to spread in Arkansas, over 100 cases in Benton CountyHeadline from Thv11 · 3 outlets
  10. New cyclosporiasis cases reported in northwest OhioHeadline from Toledo Blade · 2 outlets
  11. 2 die in connection with Michigan's cyclosporiasis outbreakHeadline from WWLP Springfield · 7 outlets
  12. Michigan's cyclosporiasis outbreak kills two peopleHeadline from WLNS Lansing · 3 outlets
  13. Two deaths linked to Cyclosporiasis in MichiganHeadline from KYMA Yuma · 27 outlets
  14. Cyclosporiasis linked to 2 deaths in MichiganHeadline from WUSA9 · 15 outlets
  15. 2 deaths reported in cyclosporiasis outbreak in Michigan as cases surpass 11,000Headline from ABC 7 Los Angeles · 3 outlets
  16. Why cyclospora can be deadly for some peopleHeadline from The Hill · 14 outlets

July 2026

  1. CDC adds 6 new states to Cyclosporiasis outbreak, reports sayHeadline from News Center Maine · 14 outlets
  2. Cyclospora outbreak clouds strong earnings for Taco Bell’s parent companyHeadline from KTVZ Bend · 12 outlets
  3. Doctor warns against 'cyclospora skinny' trendHeadline from Phl17 · 11 outlets
  4. Company at center of cyclospora outbreak complained about inspections, source saysHeadline from Billings Gazette · 1 outlet
  5. 1,100+ cases of explosive diarrhea illness cyclosporiasis reported in IndianaHeadline from Cbs4indy · 8 outlets

Coverage & sources

Read the reports, see how much was collected over time, or compare outlets by political leaning.

Coverage & sources →