The US Centers for Disease Control and Prevention (CDC) has issued a further update on its investigation into an outbreak of intestinal infection caused by the single-celled parasite Cyclospora cayetanensis that has affected at least 643 people in 25 states.
The CDC update states that the data collected during the investigation suggest that more than one outbreak actually occurred during the period from June to August. Investigations in Iowa and Nebraska showed that restaurant-associated cases were linked to salad mix produced by Taylor Farms de Mexico, but it was suspected that not all the cases included in the outbreak could be traced back to this source.
Now, epidemiological and traceback investigations in Texas have shown that some cases in the state could be linked to consumption of fresh cilantro (coriander) originating from Puebla in Mexico. A study of a cluster of cases associated with a restaurant in Fort-Bend County showed that fresh cilantro was the only ingredient eaten by all 25 people in the study. None of the ingredients used by the restaurant came form Taylor Farms de Mexico.
The outbreaks are now considered to be over and there is no evidence that contaminated salad mix or cilantro is still on the market. More details can be found here.