Home-grown Cyclospora increasing in US

While cyclosporiasis cases are reported year-round in the United States, cyclosporiasis acquired in the United States (i.e., “domestically acquired”, or cases of cyclosporiasis that are not associated with travel to a country that is considered endemic for Cyclospora) is most common during the spring and summer months. The exact timing and duration of U.S. cyclosporiasis seasons 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.

The number of reported cases of domestically acquired cyclosporiasishas increased from the previous month and remains elevated in the United States since May 1, 2019.

As of August 28, 2019, 1,696 laboratory-confirmed cases of cyclosporiasis were reported to CDC by 33 states, District of Columbia and New York City in people who became ill since May 1, 2019 and who had no history of international travel during the 14-day period before illness onset.

The median illness onset date was June 29, 2019 (range: May 1–August 13, 2019).

At least 92 people were hospitalized; no deaths were reported.

At this time, multiple clusters of cases associated with different restaurants or events are being investigated by state public health authorities, CDC, and FDA.

One multistate outbreak of Cyclospora infections has been linked to fresh basil imported from Siga Logistics de RL de CV of Morelos, Mexico . It is unknown at this time if other reported cases of Cyclospora infection in the United States this season are linked to fresh basil. This investigation is ongoing.

Many cases of cyclosporiasis could not be directly linked to an outbreak, in part because of the lack of validated molecular typing tools for C. cayetanensis.

States reporting cases: 33

Deaths: 0

Hospitalizations: 92

2019 domestically acquired cases of Cyclosporiasis