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Bacteria can get on the meat during slaughter or processing.
In whole cuts such as steak or roasts, the bacteria tend to stay on the surface, so when you cook them, the outside is likely to get hot enough to kill any bugs. But when beef is ground up, the bacteria get mixed throughout, contaminating all of the meat—including what’s in the middle of your hamburger.
Ground meat has a higher chance of being contaminated and causing food poisoning than steaks or roasts because?