Cyclospora outbreak in US sparks health alert in Mexico; leafy greens eyed as risk

Mexican health authorities are closely monitoring a Cyclospora outbreak that has impacted thousands in the United States, with concerns rising over potential cases within Mexico. Infectologist Alejandro Macías has alerted the public to the parasite, emphasizing the risk associated with consuming certain fresh produce.

The Centers for Disease Control and Prevention (CDC) in the U.S. is investigating nearly 7,000 cases, with over 1,600 confirmed since May 1. Michigan alone has reported 3,762 cases and 44 hospitalizations, illustrating the scale of the current outbreak. This surge has focused attention on fresh foods, particularly vegetables that could become contaminated during cultivation.

Cyclospora infections are transmitted primarily through contaminated water used for agricultural irrigation. This means fruits and vegetables can become infected before they are harvested and distributed. The parasite is microscopic and undetectable by sight, making it difficult to identify on seemingly clean produce. Unlike some other gastrointestinal illnesses, Cyclospora is not directly contagious between people.

Macías specifically advised caution regarding leafy green vegetables such as lettuce, cilantro, and parsley. Their structure can make it difficult to thoroughly remove any potential contaminants, even after washing. The concern is that these vegetables, if irrigated with contaminated water, could harbor the parasite and lead to the severe intestinal illness known as cyclosporiasis, characterized by explosive diarrhea.

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There is a large outbreak of CYCLOSPORIASIS (disease caused by Cyclospora cayetanensis) in the United States.