Recent cyclospora outbreaks have highlighted foodborne illnesses, but experts are concerned about other pathogens. Dr. Jill Roberts, a public health professor at the University of South Florida, emphasizes the growing impact of listeria, shigella, enterohemorrhagic E. coli, vibrio, and yersinia in the U.S. Improved lab detection has brought these issues to light, yet they cause more harm than previously realized.
Pathogen Spread and Impact
Roberts stresses understanding how each pathogen spreads to implement effective solutions. Listeria is a significant concern, especially due to limited resources in surveillance systems aimed at early outbreak detection. History has shown the dangers of listeria, with notable outbreaks linked to cantaloupe and queso fresco.
Listeria Concerns
Listeria monocytogenes can contaminate ready-to-eat foods like soft cheeses and deli meats. Symptoms range from fever to severe issues like meningitis, especially affecting vulnerable groups such as pregnant women and the elderly. In 2025, listeria in prepared pasta meals caused illnesses across 19 states, resulting in hospitalizations and fatalities. Another outbreak linked to soft cheese continues to pose risks.
Challenges with Shigella
Shigella infections, signified by diarrhea and stomach cramps, spread easily between individuals and through contaminated food. The CDC highlights an increase in drug-resistant strains, complicating treatment efforts. Vulnerable populations, particularly those without access to clean food and water, face heightened risk.
Enterohemorrhagic E. coli Threat
Strains like O157:H7 produce toxins causing severe gastrointestinal symptoms and potential kidney failure. A 2026 outbreak involving raw cheddar cheese and milk underscores the need for stringent regulations on irrigation water and banning raw milk products.
Vibrio Risks
Vibrio bacteria thrive in warm coastal waters, causing serious illness and infections. Florida reported cases and deaths tied to Vibrio vulnificus this year, continuing a trend observed in previous years. Raw oysters remain a primary source, and avoidance is recommended for vulnerable individuals.
Addressing Yersinia
Yersinia enterocolitica, linked to raw or undercooked pork, presents risks particularly to young children and the elderly. Proper cooking and banning raw milk products may curb its rise.
Despite these concerns, norovirus remains the primary cause of foodborne illness in the U.S., accounting for many cases and spiking seasonally from October through winter.
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