Persuasion skills is the answer to ur question
Prevent food handlers from contaminating their hands by touching their hair.
Literally frostbite is the term that is used to describe an area of tissue with that has lost the ability to function due to not having much blood flow due to to a extreme low in temperature. If you begin rubbing a frostbitten section you could of course exaggerate the severity of the wound by breaking the fragile area and forming wounds to which bacteria enter. Additionally you could start influencing blood flow into the area which could then start the process of gangrene (decay), which could bring toxic byproduct of the decay into the body, which could begin shutting down your body starting from the kidneys... A common disease from something like this is rhabdomylosis.
A food I often eat is eggs, and eating undercooked eggs have a high risk of having salmonella. This is why it is dangerous to eat raw cookie dough, even though I do it anyways. Salmonella is a gram negative bacterium, it is rod shaped and flagellated. Undercooking foods and leaving them in warm temperatures can cause the pathogens to grow. Habits you can practice to reduce the risk of foodbourne illness would be to always be sure your food is cooked all the way, not eat anything raw, do not leave meat out to where it gets to room temperature, and to not eat rotten meat, fruit, or vegetables.