Which type of bacteria cause spoilage of food?

The type of bacteria that cause spoilage of food are classified as undesirable bacteria. These bacteria thrive in food environments, causing changes in taste, texture, and appearance, which can render the food unpalatable or unsafe for consumption. Undesirable bacteria include a range of microorganisms that break down food substances, thereby accelerating spoilage processes such as putrefaction and fermentation that lead to off-flavors and odors.

Pathogenic bacteria, on the other hand, are specifically harmful and can cause foodborne illnesses rather than focusing on spoilage. Fermentative bacteria are often categorized as desirable in certain contexts, as they can be used in food production, such as in the making of yogurt or bread. Desirable bacteria have beneficial roles in food production and can even help preserve food, unlike the undesirable bacteria that are primarily associated with spoilage.