The bacterial species Salmonella enterica can be found in multiple animals such as poultry, pork, bovines, and reptiles, without making them sick.
It is transmitted to humans through the consumption of contaminated food, most of the time eggs, meat or milk. It can also be transmitted by drinking water contaminated with animals poop.
Cooking usually eliminates it and its proliferation is repressed if the products are kept in the fridge.