According to data from the HK Centre for Food Safety, the incidence of paralytic shellfish poisoning (PSP) cases around the world seems to be on the rise in recent decades.
In Hong Kong, according to the records of the Centre for Health Protection, between 2007 and 2011, there were 34 suspected PSP cases affecting 68 people. Epidemiological studies at that time showed a higher risk of discomfort from the ingestion of gonads of scallops.