General Information

Event name: US-24-028
Country: UNITED STATES
Nature of the harmful event:
Seafood toxins
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes (Approximate range: 48.5-956 ug/100g)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): 42 human illnesses reported consistent with PSP intoxication, 23 sought medical help, 7 hospitalized, all survived. This has not happened ever before in Oregon and was an unprecedented event in terms of intensity and resultant human health impacts.
Report the outcome of a monitoring programme: Yes (Oregon Department of Agriculture biotoxin monitoring)
Event occurred before in this location: Yes (Yes but intoxications have not been this extreme)
Individuals to contact: Manderson, Alex

Location & Date

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Location: Latitude: , Longitude:
General location information: Coastline of Oregon,
HAB Area code(s): US-22
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 2024-05-23, End: 2024-09-25
Additional date-related information: many of the intoxications memorial dayweekend

Microalgae

Causative organism known: Yes
Causative Species/Genus: Alexandrium spp. ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth:
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
California Mussels Saxitoxins 956 ug/100g Bioassay-Mouse
Kit used: Type of kit used:
Additional information: Unofficial sample collected by a family was 5,500 ug/100g
Economic losses: Industry shut down in many areas due to inability to harvest, tourism loss due to recreational clamming and shellfish harvest closures.
Management decision: Statewide recreational shellfish closures, regional commercial shellfish closures
Additional harmful effect information:
Created at 03:23 on 11 Apr 2025
IOC/UNESCO ISSHA
IOC/UNESCO ICES PICES


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