Maryland Cyclospora Cases Spike Again

2026-07-16

Numbers, not anecdotes, are driving alarm in Maryland as cyclosporiasis reports more than double within a single reporting cycle, according to state health officials tracking the intestinal parasite. The rise involves laboratory confirmed infections with Cyclospora cayetanensis, a protozoan transmitted through contaminated food or water, and now under active epidemiologic review.

This surge looks less like random noise and more like a signal of a focused exposure, health investigators say, because Cyclospora does not spread through casual contact but through ingestion of oocysts that have sporulated in the environment, a process described in parasitology texts as requiring specific temperature and humidity conditions. Cases are being interviewed with standardized questionnaires on diet history, with particular attention to fresh produce items often linked to outbreaks, including imported leafy greens, herbs, or berries that bypass cooking steps capable of inactivating the parasite.

Public advice is blunt. Wash produce, though officials acknowledge mechanical rinsing cannot fully remove microscopic oocysts, and seek medical care for prolonged watery diarrhea, fatigue, or weight loss that persist beyond several days. Clinicians are being urged to consider Cyclospora in differential diagnosis for gastrointestinal illness and to order stool testing that relies on acid-fast staining or molecular assays, since routine panels may overlook the organism. State health staff are coordinating with federal partners on traceback analysis of suspect food items, watching whether this sharp local increase hints at a broader multistate pattern.

Recommendations