What type of bacteria are considered harmful and can cause disease?

Pathogenic bacteria are the type of bacteria that can cause disease in humans, animals, and plants. These bacteria have the ability to invade host tissues and can lead to a variety of infections, ranging from mild illnesses to severe diseases. They can produce toxins and other harmful substances that disrupt normal biological processes. Understanding the role of pathogenic bacteria is crucial in various fields, including healthcare and cosmetology, as it informs practices related to hygiene, sanitation, and infection control.

Non-pathogenic bacteria, environmental bacteria, and beneficial bacteria do not typically cause disease. Non-pathogenic bacteria are often harmless and can be beneficial, living in symbiotic relationships with hosts. Environmental bacteria play essential roles in ecosystems and nutrient cycling but are not necessarily pathogenic. Beneficial bacteria, such as those found in probiotic foods, contribute positively to health and well-being. Thus, the distinction between pathogenic and non-pathogenic bacteria is vital for recognizing which types pose health risks.