Cyclospora outbreak in US reaches 15,716 cases with no confirmed source

The Centers for Disease Control and Prevention reported that a massive cyclospora outbreak in the United States has reached 15,716 confirmed cases across 47 states, resulting in 828 hospitalizations and two deaths. While one major outbreak has been traced to recalled iceberg lettuce, federal agencies are investigating at least six other active clusters with unconfirmed sources. The health scare has severely shaken consumer confidence, causing a drop in fresh produce consumption and a 20% plunge in Kraft Heinz salad dressing sales.

Cyclospora outbreak case counts

• ▪Michigan health officials reported 13,909 cases of cyclosporiasis as of mid-August 2026, noting that the rise largely reflected a processing backlog.
• ▪The Centers for Disease Control and Prevention stated that at least 11,841 additional cases of cyclosporiasis may require further investigation and analysis as of August 18, 2026.
• ▪The Centers for Disease Control and Prevention reported nearly 14,000 cases of domestically acquired cyclospora confirmed in the United States since May 2026.
• ▪The Centers for Disease Control and Prevention reported 828 hospitalizations and two deaths linked to the cyclosporiasis outbreak as of August 17, 2026.
• ▪The Centers for Disease Control and Prevention reported 15,716 confirmed cases of cyclosporiasis across 47 states in the United States as of August 17, 2026.

Iceberg lettuce source identification

• ▪The Food and Drug Administration and the Centers for Disease Control and Prevention identified recalled iceberg lettuce as the source for one multistate cyclospora outbreak.
• ▪The cyclospora outbreak linked to iceberg lettuce expanded to 17 states, with Maine and Massachusetts added to the tally in mid-August 2026.

Investigation traceback difficulties

• ▪The Food and Drug Administration and the Centers for Disease Control and Prevention are investigating at least six other cyclospora clusters for which sources have not yet been confirmed.
• ▪The Food and Drug Administration is conducting traceback on five active cyclospora outbreaks, including one late July outbreak that grew to 172 cases and an early August outbreak that grew to 11 cases.
• ▪Gwen Biggerstaff of the Centers for Disease Control and Prevention explained that cyclospora investigations take a significant amount of time due to symptom onset delays and sequencing difficulties.

Consumer produce avoidance

• ▪Nielsen data cited by TD Cowen analyst Robert Moskow showed Kraft Heinz Company's salad dressing sales fell 20% and Clorox Company's Hidden Valley Ranch sales fell 5% over a four-week period ending in August 2026.
• ▪The cyclospora outbreak caused United States consumers to forgo eating fresh produce and dining in restaurants, reducing demand for leafy greens.

Cyclosporiasis symptoms treatment

• ▪Cyclosporiasis is caused by the cyclospora parasite and can lead to gastrointestinal symptoms including diarrhea, nausea, and other symptoms.
• ▪Healthcare experts advise individuals experiencing cyclosporiasis symptoms, particularly diarrhea lasting more than a week or two, to seek medical care, as untreated infections can persist for a month or longer.

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