For fish to be eaten ras, it must be frozen at temps as listeThe by the FDA, that is: -4 degrees Fahrenheit for a minimum of seven days, or for 15 hours at a temperature of -31 degrees F. Raw f ish can contain parasites as well as bacteria, fungus, and other nasties. The extreme cold will kill the parasites and fungus, rendering these harmless.
Raw beef carries its contaminants on the meat surface, as was mentioned by the others before my post. There is one way to be absolutely sure that your raaw food is free of danderous micro-critters. If the food has been iradiated with gama rays, it will be safe to consume raw. In fact, iraduated foods, so long as they are properly packaged, even milk, need no refrigeration.
Me, I don't have a gamma ray emitter available to me, and so I will stick with cooked proteins. And remember, some micro-critters, such as E-Coli can be found in uncooked veggies as well as uncooked meat. I overheard a biologist once say that if people knew how many bad thngs there are out the that can hurt us, and are everywhere, they would be afraid to get out of bed.
Oh, but wait, bed isn't safe either. There might be dust mites, or bedbugs, or head lice, or, or, or...
The best we can do is follow safe practices as well as possible, and learn the science of food safety. There are numerous resources that teach food safety, and in depth enough to certify you.
Seeeeeya; Chief Longwind of the North