What is a common characteristic of pathogenic bacteria?

Pathogenic bacteria are primarily characterized by their ability to cause infections and diseases in humans and other organisms. This is their defining trait, as these bacteria possess various mechanisms that enable them to invade host tissues and evade the immune system, leading to illness.

While some bacteria play beneficial roles, such as those involved in digestion or in maintaining skin health, pathogenic bacteria do not fall into this category. Additionally, pathogenic bacteria are not exclusively found on the skin; they can exist in various environments, including air, water, and food, as well as within the human body.

Thus, the critical aspect that sets pathogenic bacteria apart is their potential to harm health, which aligns directly with the correct choice. Understanding this characteristic is essential for estheticians, as it informs infection control practices and awareness of the importance of sanitation in their work.