The term "most pasteurized" refers to food or drink products that have been treated with heat to kill harmful bacteria. The opposite of this term can be expressed as "least pasteurized" or "unpasteurized." Unpasteurized products are not subjected to heat treatment, and therefore carry a higher risk of bacterial infections such as Salmonella or E. coli. Some consumers prefer unpasteurized products due to perceived health benefits, but health authorities recommend that vulnerable populations, such as pregnant women, young children, and those with weakened immune systems, should avoid them. Unpasteurized products include raw milk and certain cheeses, fruit juices and ciders, and even some beers and wines.