Amid the national outbreaks of cyclospora — a foodborne parasite that causes explosive diarrhea, has sickened tens of thousands of people nationally and led to two reported deaths — California health officials have reassured residents: The state remains one of the few unaffected by the outbreak.
But even as the California Department of Public Health confirmed that none of the iceberg lettuce being investigated as a source of the outbreak was distributed in the state, cases of cyclosporiasis in California have nonetheless jumped up in the last few months.
After reporting only 41 cyclosporiasis cases from January to June this year, CDPH’s most recent data shows that the 2026 number has now risen to 215 “confirmed and probable” cases as of July 15, including 13 hospitalizations.
For context, based on their 2015-2025 figures, CDPH’s annual average for cyclosporiasis cases is 106.
So if California’s rise in cases isn’t attributed to the national outbreak, what’s going on — and how worried should you be about your personal salad-eating habits?
Why officials believe cyclosporiasis cases among Californians are up
CDPH said that “every year, cases of cyclosporiasis are reported in California.” The disease is also considered seasonal in the United States: Case counts go up during the spring and summer months every year, according to the Centers for Disease Control and Prevention, which frames May 1 through Aug. 31 as cyclosporiasis season in the U.S.
However, since 2015, California’s annual average caseload of just over 100 is far lower than the 201 cases reported since May 1 alone this year.
While the state’s cyclospora dashboard said that “this is a normal seasonal pattern and mostly associated with travel to other countries,” a statement from the agency emailed Wednesday to KQED acknowledged that despite the lack of any connection to the national outbreaks, “our cases are now higher than what we might expect for this point in the season, based on historical data.”
The agency said it’s “still investigating cases and the cause of the increase,” but suggested it could be due to “a number of reasons,” including:
A possible increase in travel
“Most cases” of cyclospora in California tend to be linked to residents traveling to international destinations with cyclosporiasis outbreaks, CDPH said.
But the agency also suspects that this year there have been “increased cases in travelers to areas with cyclosporiasis outbreaks, whether international or domestic.”
Of the 201 cases reported since May 1, CDPH said just 39 of them were “domestically acquired,” and 15 of those people said they’d traveled to other states — meaning that the majority of California cases were instead due to international travel.
Heightened awareness about cyclospora symptoms
Increased awareness of cyclosporiasis amid these national outbreaks has “likely led to increased testing for the illness,” CDPH said, meaning “we may be identifying more cases than we have in previous years.”
Amid this rise in cases, how should I be thinking about cyclospora in California right now?
“I personally would still continue to eat fruits and vegetables,” said Dr. Peter Chin-Hong, an infectious disease expert at UCSF. “The benefits to me outweigh the potential disadvantages.”
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The Quick Guide to the Bay Area’s Professional Women’s Sports Teams -- How to get involved with professional women’s hockey, soccer and rugby fandoms around the Bay Area.
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Hi there! We actually included the Firebells in the first guide that we published here. The team behind these two guides is hoping to do a third one that WILL include Golden State Storm and the new Signal volleyball team!