Yeast is a single cell organism, classified as part of the fungus kingdom. It is commonly used to leaven foods and ferment sugar in alcoholic beverages. However yeasts can lead to food spoilage and can also cause candidiasis in certain individuals.
These procedures enumerates the amount of yeast present in a sample using a spread plate, pour plate, petrifilm or air sediment method.
Also see Mold
, as these tests are typically performed together.