Infectious Disease Center

Infectious Diseases: What Are They?

An infectious disease is a disease caused by bacterial, viral, fungal, or protozoan infection. Though some infectious diseases are not contagious, others may be transmitted from animal to person (bird flu and cat scratch disease) or from person to person (MRSA, HIV, and other STDs). Get the facts on the various types of infectious diseases, and read the latest statistics and news about emerging infections. Learn about infectious disease prevention by reading MedicineNet's Childhood Immunization Schedule and Vaccination Schedule for Adults and Adolescents articles. »