The Centers for Disease Control and Prevention (CDC) and state public health officials have identified annually recurring outbreaks (in 2012, 2013, and 2014) of cyclosporiasis in the United States which have been associated with fresh cilantro from the state of Puebla, Mexico. There is currently (in July 2015) another ongoing outbreak of cyclosporiasis in the United States in which both the Texas Department of State Health Services and the Wisconsin Department of Health Services and the Wisconsin Department of Agriculture, Trade and Consumer Protection have identified cilantro from the Mexican state of Puebla as a suspect vehicle with respect to separate illness clusters.
Cyclospora cayetanensis is a human-specific protozoan parasite that causes a prolonged and severe diarrheal illness known as cyclosporiasis. In order to become infectious, the organism requires a period outside of its host. Illnesses are known to be seasonal and the parasite is not known to be endemic to the United States. Cyclosporiasis occurs in many countries, but it seems to be most common in tropical and subtropical regions. People become infected with C. cayetanensis by ingesting sporulated oocysts, which are the infective form of the parasite. This most commonly occurs when food or water contaminated with feces is consumed. An infected person sheds unsporulated (immature, non-infective) C. cayetanenis oocysts in the feces.
Based on epidemiological evidence collected by affected domestic states, the CDC and traceback evaluations conducted by FDA, cilantro from the state of Puebla, Mexico was implicated as the vehicle for some of the U.S. cyclosporiasis infections in 2013 and 2014. In addition, after cyclosporiasis illnesses from the 2013 outbreak were linked to cilantro from Puebla, FDA reviewed a cluster of cyclosporiasis illnesses from 2012 in which the state of Texas had previously identified cilantro as one of multiple possible suspect vehicles and determined that cilantro from the state of Puebla, MX was supplied to the point of service implicated in that outbreak. While this means that cilantro from the state of Puebla, MX was one potential source of the 2012 outbreak, this was not confirmed by epidemiological means. The Texas Department of State Health Services has also identified cilantro from the state of Puebla as a suspect vehicle in an ongoing outbreak (as of May 2015). Additionally, in the 2015 outbreak Wisconsin officials have identified cilantro from the state of Puebla, MX as a suspect vehicle for a cluster of illnesses associated with a single restaurant. The source(s) of the 2015 outbreak(s) are still under investigation.
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