Los Angeles County monitors multistate cyclosporiasis outbreak as U.S. cases exceed 1,600

Los Angeles County is monitoring a domestically acquired, multijurisdictional cyclosporiasis outbreak under investigation by state and federal public-health agencies, the county Department of Public Health said July 13.

No cases linked to the outbreak had been identified in Los Angeles County at the time of the county notice. The alert does not describe a Los Angeles County outbreak; it reports the county’s surveillance status during a broader investigation.

Nationally, the Centers for Disease Control and Prevention had received reports of 1,645 laboratory-confirmed U.S. cases as of July 13, according to the county. That is compared with 249 cases reported nationally by the comparable point in 2025.

What is known — and what remains under investigation

The Los Angeles County Department of Public Health characterized the event as a multijurisdictional outbreak that was domestically acquired. State and federal public-health agencies were investigating it.

The available county notice did not identify a confirmed food source, restaurant or supplier. It also did not establish that the higher national count resulted from one common exposure. Those distinctions matter because an investigation can involve case reports across jurisdictions before investigators determine whether, and how, cases are connected.

The 1,645 figure is a national count of laboratory-confirmed reports received by the CDC, not a count of Los Angeles County cases. The county’s reported local figure was zero linked cases as of its July 13 alert.

Guidance for county residents

County Public Health included information intended to help residents reduce infection risk and recognize symptoms. The notice is public-health guidance, rather than a county mandate or a finding that people in Los Angeles County have been exposed through a particular food or business.

Residents seeking information should rely on updates from the Los Angeles County Department of Public Health and other public-health agencies as the investigation develops. The agency’s monitoring notice provides the county-specific context: a national outbreak was being investigated, while no linked cases had been identified locally at the time of publication.

Case totals and local status can change after an initial alert. The county’s reported figures and its no-linked-cases status are dated to July 13, 2026, and should be read as a snapshot from that reporting date rather than a final account of the investigation.

Why the alert matters

The notice gives Los Angeles County residents a current update on a foodborne-disease investigation while separating the nationwide case count from local conditions. It also signals that county health officials are tracking the investigation and sharing prevention and symptom information even though no outbreak-linked county cases had been identified.