Eating raw or undercooked foods is a common cause of food poisoning. Proper cooking destroys bacteria, but they can start to grow on cooked food if it is left out or in the refrigerator for too long. Food also can become contaminated when someone infected with a virus or other “bug” handles it.
Paying attention to food safety rules and being extra careful when handling, preparing, and storing food is definitely important. However, some people who are receiving or have recently finished cancer treatment should avoid some foods entirely, even if they may have eaten them with no problems in the past. These include:

Cold hot dogs or deli lunch meat (cold cuts)—Always cook or reheat until the meat is steaming hot.

Dry-cured, uncooked salami
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https://bibiorganics..com/2020/05/food-to-avoid-during-and-after-cancer.html?m=1