If butter becomes infected with a foreign bacteria, it can easily make someone who ingests it sick. One of the most common types of infection agents to get into butter is listeria. It is typically found in ready-to-eat foods that are typically chilled. Some of the other common foods that listeria can be found in includes pate, pre-packaged sandwiches, soft blue cheese, brie, and smoked salmon as well as cooked slices of meat.
Those who store their butter properly can avoid getting poisoned by it. Each year hundreds of people get very sick from listeria as well as salmonella and other types of bacteria that can get into certain types of food one way or another. When you know how to protect yourself against them as best as possible, you will reduce your chanced of having to deal with food poisoning.