Which type of bacteria is known to be harmful and may cause disease?

Pathogenic bacteria are specifically recognized for their ability to cause disease in humans, animals, and plants. They can invade host organisms, reproduce, and produce toxins that disrupt normal biological processes, leading to a wide range of health issues.

Understanding the term "pathogenic" is essential, as it encompasses bacteria that are directly linked to infections and illnesses. Examples of pathogenic bacteria include Salmonella, E. coli, and Streptococcus, which are known for causing foodborne illnesses, respiratory infections, and more.

In contrast, nonpathogenic bacteria, while they may be present in the same environments, do not typically cause harm and can even exist beneficially in the human microbiome. Beneficial bacteria play crucial roles in processes such as digestion and synthesizing vital vitamins. Symbiotic bacteria form mutually beneficial relationships with hosts, but they are also not harmful. These distinctions clarify why pathogenic bacteria are specifically associated with disease causation.