Background
Scombroid fish poisoning (scombrotoxism, scombroid ichthyotoxicosis) is a food-related illness typically associated with the consumption of fish. The syndrome derived its name because early descriptions of the illness noted an association with Scombroidea fish (eg, large dark meat marine tuna, albacore, mackerel); however, the Centers for Disease Control and Prevention (CDC) have identified the largest vector to be nonscombroid fish, such as mahi-mahi and amberjack. One case report documents a large outbreak related to escolar (rudderfish, oilfish) consumption, a species whose high waxy ester content can cause some gastrointestinal symptoms (keriorrhoea) that may overlap with those caused by scombroid poisoning.[1] Epidemiologic data from the CDC suggest that scombroid poisoning is the principal chemical agent type of food-borne disease found in the United States; the second most common is ciguatera poisoning.[2]
Pathophysiology
Most of the published literature suggests that symptoms are related to the ingestion of biogenic amines, especially histamine; others, like putrescine and cadaverine, may potentiate toxicity.[3]Histamine is produced via bacterial decarboxylation of histidine and is normally present at levels less than 0.1 mg per 100 g of fish. In contrast, samples of fish that produce poisoning contain histamine levels of at least 20-50 mg per 100 g of fish. Serum histamine levels and urinary histamine excretion are elevated in humans with acute illness. Antihistamines (H1- and H2-blockers) have been used with good efficacy and safety to abate or abolish the symptoms.
Epidemiology
Frequency
United States
Scombroid poisoning is relatively uncommon (although likely highly underreported), making up 5% of food-borne disease outbreaks reported to the CDC. The American Association of Poison Control Centers does not maintain specific data on scombroid poisoning, as noted in its 1998 annual toxic surveillance report.
International
Although scombroid poisoning is more common in nations with a warm water fishing industry, the illness is worldwide in scope. The most commonly implicated fish species are scombroid dark meat fish (eg, tuna, mackerel, skipjack, bonito, marlin) and nonscombroid species, such as mahi-mahi (dolphinfish),amber jack, sardine, yellowtail, herring, and bluefish. Although rare, cases of whitefish scombrotoxism also have been reported.
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