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July 14, 2026
***Missouri health care facilities and health care providers***
The Missouri Department of Health and Senior Services (DHSS) is receiving a substantial increase in reports of Missourians testing positive for Cyclospora. Over 80 positive laboratory reports have been received by DHSS through routine disease reporting during the week of July 7 – July 14, 2026. These reports are under investigation by local public health agencies (LPHAs) in Missouri in collaboration with DHSS. DHSS continues to review information from Missouri cases and is working in collaboration with the Centers for Disease Control and Prevention (CDC) and other states to investigate the increase in cases reported nationally. Health care providers should consider cyclosporiasis in patients presenting with prolonged or relapsing watery diarrhea, particularly during the May–August cyclosporiasis season, even in the absence of a history of international travel. Promptly report patients with cyclosporiasis to the LPHA or DHSS per established routine reporting processes and protocols. Please contact your LPHA or the Missouri DHSS Bureau of Communicable Disease Control and Prevention at 573-751-6113 or 800-392-0272 (24/7) with questions regarding this CDC Health Advisory.
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Summary
The Centers for Disease Control and Prevention (CDC) is notifying clinicians, public health practitioners, and laboratorians of cases of domestically acquired cyclosporiasis in multiple U.S. states. Since May 1, 2026, CDC has received reports of 1,645 confirmed domestic cases of cyclosporiasis and is aware of more than 5,100 cases that require further analysis to confirm the illness as domestically acquired cyclosporiasis. This is substantially higher than the 249 cases reported nationally by this same time last year. Of the 1,645 case-patients with available information, 141 (9%) were hospitalized, and none have died. CDC, the U.S. Food and Drug Administration (FDA), and state and local health departments are working together to investigate multistate outbreaks of Cyclospora infections and to identify the sources of illness. Because cyclosporiasis is often underdiagnosed and underreported, the true number of illnesses is likely higher than what has been reported to CDC. This Health Advisory provides background information about cyclosporiasis, current U.S. surveillance data, and recommendations for clinicians, laboratorians, and public health departments to support recognition, diagnosis, and reporting.
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Submitted by: ERC Duty Officer, Emergency Response Center (ERC) Missouri Department of Health & Senior Services 912 Wildwood Dr., PO Box 570 Jefferson City, MO 65102-0570 Phone: 573-526-9711, Facsimile: 573-526-8389 Email: DRMS@health.mo.gov |
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CDC's Message Types:
Health Alert: Conveys the highest level of importance about a public health incident.
Health Advisory: Provides important information about a public health incident.
Health Update: Provides updated information about a public health incident.
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