The Cyclospora Outbreak of 2022: A Quick Guide


Cyclosporiasis illnesses are reported year-round in the United States. However, during the spring and summer months there is often an increase in cyclosporiasis acquired in the United States (i.e., “domestically acquired”). The exact timing and duration of these seasonal increases in domestically acquired cyclosporiasis can vary, but reports tend to increase starting in May. In previous years the reported number of cases peaked between June and July, although activity can last as late as September. The overall health impact (e.g., number of infections or hospitalizations) and the number of identified clusters of cases (i.e., cases that can be linked to a common exposure) also vary from season to season. Previous U.S. outbreaks of cyclosporiasis have been linked to various types of fresh produce, including basil, cilantro, mesclun lettuce, raspberries, and snow peas.

At a Glance

  • Illnesses: 1,060
  • Hospitalizations: 69
  • Deaths: 0
  • States reporting cases: 33

CDC, along with state and federal health and regulatory officials, monitor cases of cyclosporiasis in the United States in the spring and summer months to detect outbreaks linked to a common food source. However, many cases of cyclosporiasis cannot be directly linked to an outbreak, in part because of the lack of validated laboratory “fingerprinting” methods needed to link cases of Cyclospora infection. Officials use questionnaires to interview sick people to determine what they ate in the 14-day period before illness onset. If a commonality is found, CDC and partners work quickly to determine if a contaminated food product is still available in stores or in peoples’ homes and issue advisories.

Latest Information

  • The number of reported cases of domestically acquired cyclosporiasis illnesses has increased by 260 cases since the last update on August 25, 2022. Cases continue to be reported.
  • As of September 28, 2022, 1,060 laboratory-confirmed cases of cyclosporiasis in people who had no history of international travel during the 14-day period before illness onset have been reported to CDC by 34 jurisdictions, including 33 states and New York City, since May 1, 2022.
  • The median illness onset date is June 30, 2022 (range: May 1, 2022–August 28, 2022).
  • At least 69 people have been hospitalized; 0 deaths have been reported.

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