CDC Analyzed Marine Toxin Foodborne Outbreaks

A new study reveals key trends in marine toxin illnesses across the United States from 2011 to 2023.

Updated on Oct. 2, 2026 in Nutrition

Isometric editorial illustration showing a tuna and a coral fragment, representing environmental research on marine toxin-related foodborne illness. — The CDC released a study tracking over 400 marine toxin outbreaks from 2011 to 2023, identifying environmental and handling risks as primary factors. AI Illustration. Upload story photo >

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The CDC has published a study detailing 402 noninfectious foodborne disease outbreaks involving marine toxins between 2011 and 2023. These events led to 1,280 illnesses, 96 hospitalizations, and one death nationwide.

Why it matters

Understanding the origins of these outbreaks is critical as warming waters, reef damage, and coastal construction create conditions that allow toxin-producing algae to thrive. This data highlights the specific environmental and handling factors driving these health risks.

The study confirmed 1,280 total illnesses and 96 hospitalizations across 402 outbreaks. While scombroid and ciguatoxin represent nearly all cases, shellfish-associated toxins accounted for 13 specific outbreaks during the study period.

The players

Centers for Disease Control and Prevention

The national public health agency of the United States that leads efforts to prevent and control infectious and noninfectious disease outbreaks.

The details

Scombroid toxin typically forms when bacteria multiply on improperly stored fish, while ciguatoxin accumulates in larger reef predators as algae-produced toxins move up the food chain. Tuna was identified as the source in 76 percent of scombroid outbreaks, most of which originated in sit-down restaurants, whereas 80 percent of ciguatoxin cases were traced to private homes.

The CDC study analyzed outbreaks occurring from 2011 through 2023.
The report was officially published on October 2, 2026.

The Big Picture

This study follows the precedent set by systematic federal public health surveillance programs used to monitor and categorize national foodborne illness trends. It establishes a baseline for how changing environmental conditions are influencing noninfectious food safety outcomes.

Consumers should be aware that proper fish storage and handling are essential to prevent scombroid toxin buildup. Individuals in high-risk regions like Hawai'i, Florida, Alaska, and Puerto Rico should remain informed about localized advisories regarding reef-associated predatory fish.

The takeaway

Marine toxin risks are heavily influenced by both global environmental shifts and local food handling practices in homes and restaurants. Practicing safe preparation methods remains the most effective way to minimize the likelihood of contracting foodborne illnesses from seafood.