Infectious Diseases and Contagious Infectious diseases are caused by pathogenic microorganisms, such as bacteria, viruses, parasites or fungi. These diseases can spread in the environment or be transmitted from person to person, causing the disease to reside in our communities. Find information about… Blood-borne diseases Resources on blood borne infections: Viruses that are carried by … Continue reading Infectious Diseases and Contagious (viruses, bacteria, parasites, fungi, protozoa)