Introduction to microbiology... Definitions of microbes, microbiology, the size, shape, appearance, and place in the environment. Difference between normal flora and infectious microbes.Explanations and examples of the terms disease, pathogens,and parasites. Pathways to infection including the skin, body fluids, airborne particles, fecal contact and contact with surfaces. Pathogens can be either viruses, bacterial, fungi, protozoa or worms. The general anatomy and physiology of a virus was introduced.