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Submitted: 16 May 2007
HERDIN Record #: PCHRDHE901704

PSP outbreak in Victorias, Negros Occidental.

 Dayrit MM,
 White FM,
 Gopez IL,
 White ME,
 Pastor NIS

An outbreak of Paralytic Shellfish Poisoning (PSP) occurred in Victorias, Negros, Occidental from December 12 to 19, 1988. There were 109 cases with an age range of 1-71 years and a mean age of 30 years. Fifty-nine percent of the cases were females while 41% were males. The over-all attack rate was 170/100,000 population. Four cases died giving a case-fatality ratio of 4%. The cases who died were 3 girls and 1 boy with mean age of 7 years
A matched-pair case-control study was done which showed the food implicated to be the "tahong" or green bay mussels by McNemars test ( p value .001, OR
Toxicological analysis of "tahong" revealed 47 ug/100 gms, shellfish meat, way below 80 ug/100 gms. which is considered the set safe level. This could be due to the variability of toxin level in different parts of the sea or problems with the assay
The outbreak was contained within a few days due to the productive linkage between the Department of Health, Bureau of Fisheries and Aquatic Resources, the provincial and municipal governments and mass media. They organized a red tide task force which did an extensive information campaign leading to the rapid decrease in the number of PSP cases and in the prevention of potential cases. As part of the control measures, banning of bivalve shellfishes from Victorias until BFAR shows the level to be safe was recommended. There should be active surveillance to prevent human illness and deaths.(Summary)

Publication Type
Special Collection
FETP Scientific Papers in Progress
Publication Date
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FETP 312.7 Abstract Print Format (Request Document)

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