If you do, make sure it's really well cooked. Seafood is not inherently dangerous or toxic, but can of course harbour different types of food poisoning bacteria including e. coli and salmonella (oysters, mussels); viruses and the improbably named scombrotoxic food poisoning caused by bacteria producing histamine (crab meat). Food poisoning can be severe, causing vomiting, diarrhoea and dehydration and could rarely precipitate preterm labour.