Understanding the Latest Cyclospora Outbreak

In recent months, the United States has seen an uptick in cyclosporiasis cases, an illness triggered by the Cyclospora parasite typically linked to consuming tainted produce or water. This summer, the country recorded its highest count of cases, causing concern among many.

Dr. Emily Oster, the creator of ParentData, points out that although the surge may seem alarming, the actual numbers suggest a more measured response may be appropriate. The heightened public attention is understandable due to the distressing symptoms of the illness, which include severe diarrhea.

Currently, the Centers for Disease Control and Prevention (CDC) have confirmed 1,645 cases since May 1, with around 5,100 more suspected cases pending verification. While these figures represent a peak in Cyclospora infections, they are small when compared to nearly 35,000 cases of Campylobacter — another severe diarrheal illness — reported this year. Norovirus, however, remains a far more prevalent concern in the U.S., affecting up to 21 million Americans annually and resulting in more than 100,000 hospitalizations and nearly 1,000 deaths.

Though Cyclospora may cause illness lasting a month or more, infections typically resolve with antibiotics and are rarely fatal. Importantly, it’s not contagious between people.

Regionally, Michigan and Ohio have seen a more pronounced rise in cyclospora cases, while other states show no significant increases. For example, California observed a decrease in infections compared to last year, with 41 cases reported versus 80 last year during the same timeframe. In Connecticut, the increase translated to 35 cases this year compared to 19 last year — this represents about one case per 100,000 people.

Overall, while the concern is valid due to symptoms and media attention, data indicate that there’s no need for widespread alarm.