Which type of bacteria is responsible for causing disease?

Pathogenic bacteria are the type of bacteria that are responsible for causing disease. These microorganisms have the ability to invade host tissues, evade the immune system, and produce toxins that can lead to illness. Pathogenic bacteria include well-known pathogens such as Streptococcus, Staphylococcus, and Escherichia coli, which can cause a range of infections from mild to severe.

In contrast, non-pathogenic bacteria do not cause disease and may even be beneficial to humans, playing critical roles in processes such as digestion and nutrient absorption. Robust and commensal bacteria also differ significantly; while robust may refer to the strength or resilience of bacteria, it does not pertain to their pathogenic potential. Commensal bacteria live in harmony with their host and, while they can sometimes be opportunistic under certain conditions, they are not primarily responsible for disease. Thus, recognizing that pathogenic bacteria pose a threat to health is crucial in the field of esthetics and beyond, particularly in infection control and hygiene practices.