Caused by pathogenic microorganisms, such as bacteria, viruses, fungi, and parasites. They can spread from person to person, usually through direct or indirect contact. Examples include flu, measles, tuberculosis, and HIV.
Caused by pathogenic microorganisms, such as bacteria, viruses, fungi, and parasites. They can spread from person to person, usually through direct or indirect contact. Examples include flu, measles, tuberculosis, and HIV.