Which type of bacteria do not cause disease?

Nonpathogenic bacteria are those that do not cause disease. In fact, many nonpathogenic bacteria play beneficial roles in various environments, including the human body. For instance, nonpathogenic bacteria are essential for processes like digestion and help in maintaining the natural balance of the microbiome. They are found in places such as the skin, intestines, and even in food, contributing to health and well-being.

In contrast, pathogenic bacteria are known for causing diseases, leading to infections and health issues when they invade the body. Facultative bacteria have the ability to thrive in both aerobic (with oxygen) and anaerobic (without oxygen) environments, and while they can be harmless, some may also cause disease. Aerobic bacteria require oxygen to survive, and similar to facultative bacteria, some may be nonpathogenic while others can be harmful. Therefore, the distinction of nonpathogenic bacteria as those that do not cause disease makes it the correct answer.