My brother-in-law has just retired as a university lecturer and his colleague has been studying UK seafood and the risks for over 10 years. He wouldn't eat any seafood for the very same reason, some of the poisoning cases he's been asked to look at are really scary. He was involved in looking at at a bad case at one of Heston Blumenthal's restaurant, the seafood came from near a sewage outlet and were full of really nasty bugs and viruses 😳