Paralytic Shellfish Poisoning (PSP) is a severe and potentially fatal form of seafood poisoning caused by consuming shellfish contaminated with neurotoxins. These toxins are produced by microscopic marine algae (dinoflagellates) during harmful algal blooms, often called \"red tides.\" It primarily affects people who eat contaminated bivalve shellfish like clams, mussels, oysters, or scallops.
Transmission methods vary. Please consult CDC or WHO resources for specific information.
Contagious Period: Varies by disease
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Thirty-three cases of paralytic shellfish poisoning occurred in coastal Guangdong Province following consumption of okadaic acid-contaminated conchs, with all patients experiencing mild to moderate symptoms and no fatalities. This pre-Spring Festival outbreak highlights ongoing risks from heat-resistant shellfish toxins along China's southern coast, where seasonal red tide algae proliferation creates persistent contamination hazards during peak shellfish consumption periods.
Source: BEACON - View Full Report
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View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-03-04
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