Undercooked animal products (runny eggs, undercooked poultry, rare burgers, etc.
)can spread certain bacterial food "poisoning". Cross contamination of cutting boards, with e.g. Raw meat, and then other materials can spread disease. Wash hands. Rare steak ok (germs on outside get cooked, meat inside is sterile); rare burgers: can't tell what came from where. Less the cooking temp, more the meat's.