What are the Diseases Caused by Microbes Infectious (communicable) Diseases : These diseases are spread from infected person to other in various ways, i.e., through air, water, food, physical contact, sexual act and insects. The causative agents of these diseases are called pathogens or infectious agents. These may be viruses, bacteria, fungi, protozoans (single-called … [Read more...] about What are the Diseases Caused by Microbes