Cold prawns are also fine, as long as they are cooked and chilled properly. The ones you get from the supermarket would be fine as long as they are not hanging about for too long in warm temps!
The problem with any food posioning/bacteria is when the bacteria has the opportunity to multiply....ie if prawns are left out in a salad say, & then it gets a bit warm, the prawns are exposed to cross contamination (from people and/or other foods) and then the bacteria has the ideal environment to grow (ie warm and moist).
So clean cooked chilled prawns are fine......just don't let them hang around too long!
Guys, I did 4 long and boring years at uni doing all this, so any questions re food/listeria/nutrition, just let me know and I will do my best.
Just a point on Listeria.......the reason that these days all Dr's etc encourage us to be strict and vigilant about what we as pregnant women eat is because the Listeria bacteria doesn't always affect us (the mothers) .....it has the potential to only attack the unborn child. That is why you need to be so cautious, because you might not feel sick, but it could aftect the unborn bubs. It also can take a long time for Listeria to incubate, so you might not feel ill until up to a few weeks after you have eaten an offending food.
I might maybe do a post on the basics of Listeria and put it as a sticky?
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