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This article describes a kind of cheese produced primarily in Canada and the United States . In many countries, the term "Swiss" is a Geographical indication and is legally restricted to items produced in Switzerland. For cheeses produced in Switzerland see Cheeses of Switzerland.
Swiss cheese is the generic name, in Australia, New Zealand, Canada and the United States, for several related varieties of cheese, all of which resemble the Swiss Emmental. Some types of Swiss cheese have a distinctive appearance, as the blocks of the cheese are riddled with holes known as "eyes". Swiss cheese is known for its nutty, bittersweet taste. Three types of bacteria are used in the production of Emmental cheese: Streptococcus thermophilus, Lactobacillus (L. helveticus or L. bulgaricus), and Propionibacter (P. freudenreichii or P. shermani). In a late stage of cheese production, the Propionibacter consumes the lactic acid excreted by the other bacteria, and releases carbon dioxide gas, which slowly forms the bubbles that develop the eyes. Swiss cheese without eyes is known as "blind." In general, the larger the eyes in a Swiss cheese, the more pronounced its flavor; this is because the same conditions that lead to large eyes - longer aging or higher temperatures - also give the acting bacteria and enzymes more time to produce flavor. This poses a problem for makers of pre-sliced Swiss cheese, the most popular category in the United States. Cheese with large eyes doesn't slice well, sometimes coming apart in mechanical slicers. This costs time and money and is one reason why US manufacturers usually produce a product less aged and flavorful than imported cheeses of the same style. Baby Swiss is another related cheese, often found in the US. Made by substituting water for the milk's whey to slow bacterial action, baby Swiss cheese has smaller holes and a milder flavor. Baby Swiss is often made from whole milk. Lacy Swiss is a further variety of US small hole Swiss cheese made with low fat milk. Lorraine Swiss is an example of this style.
As a metaphor
"Swiss cheese" is often used as a term for when an item has real or metaphorical holes in it, such as a bullet-holed wall, or a faulty memory or a poor alibi.
