Which type of primary bacteria is known for performing useful functions in the body?

Non-pathogenic bacteria are known for performing useful functions in the body, particularly as part of the microbiome that supports various bodily processes. These bacteria contribute to digestion, synthesizing vitamins, and protecting against harmful pathogens by competing for resources and space.

In the context of skin care and the esthetician field, non-pathogenic bacteria can play a role in maintaining skin health by supporting a balanced and healthy skin microbiome, which helps to protect against skin issues like acne or infections caused by pathogenic bacteria.

The other types of bacteria listed, such as pathogenic and virulent bacteria, are associated with causing diseases and infections, while anaerobic bacteria simply refer to a group of bacteria that do not require oxygen for growth and are not directly defined by their beneficial or harmful properties. Hence, focusing on non-pathogenic bacteria highlights their essential roles in maintaining health and homeostasis in the body.