Hope you will find this useful. I saw from a Australia forum at:
http://www.essentialbaby.com.au/forums/index.php?/topic/6164-eating-prawns-during-pregnancy/
mamadom
Posted 03 April 2005 - 10:41 AM
NO!!!!!
The reason you are not supposed to eat prawns isn't because they are bad in themselves but because of listeria. Like with cold meat, salami, fresh cheese, chicken and all left-overs, after 12 hours this bacteria can develop, regardless of refridgeration. It's something we probably consume all the time and don't get sick from, but can be dangerous to gestating babies and make you go into labour early. It's not very likely, but it does happen. Don't panic about what you ate over Easter though, you would have had some symptoms by now and like I said, it isn't very likely. Lots of people disregard all this stuff and think the risk is too minimal to worry about.
If you want to be safe and you love prawns, buy them uncooked, cook them yourself and eat before they have been cold for 12 hours - easy. But pre-cooked prawns and other seafood or cold meat should not be eaten without being heated to boiling hot. You could just zap them quickly in the microwave. Same with fresh cheeses - they're fine if you cook with them and eat your meal hot, but cold they supposedly pose a risk.
This is all according to RWH hand-out I have about listeria."