What happen to food if exposed to cross contamination?

Well, I can tell you an example. Ok, let's say you had a raw piece of beef that's really juicy in a piece of tin foil in the top shelf of your fridge. Now let's say a hole was in the tinfoil. Below the beef on the lower shelves are, let's say, a piece of cooked fish in a piece of tin foil that wasn't wrapped very good. So the tin foil with the fish has a space in it where anything could go into it and land on the piece of cooked fish. Now, lets say the juice from the raw piece of beef came out of the tin foil and dripped down the fridge into the tin foil with fish in it and it got on the piece of fish. Now, let's say you took out the piece of fish without realizing there was raw beef juice everywhere. Now, you heated up the fish on the grill. Already, that just made it a lot more cross contaminated. When the raw beef juice landed on the fish and stayed there, that's food cross contamination. Food cross contamination is basically food poisoning. If you cooked 2 different raw things together, your mixing 2 nasty raw things together and cross contaminate. Get it, contamination as like when you mix 2 different things together and cross as in 2 or more things. Sorry if this is not what you wanted. I try to help everyone :/ -Bree