Write the following words on a piece of paper; pathogen, diseases, body, cell, host, enter. Listen for plural and singular forms of these words and make a mark for each time you hear the word. Check your understanding. Answer questions. A pathogen is typically used to refer to a microorganism that can cause disease which in its turn can spread to one person to another. In daily language pathogens are usually referred to as germs . In short pathogens are foreign infectious microbes that cause sickness and disease . Bacteria, viruses, fungi, and protozoa are the most common types of pathogens and each effects the body in different ways. Pathogens can enter the host through the nose, mouth, eyes, or through a cut or any other opening in the body. 1. Bacteria In the case of bacteria once it enters the body it releases toxins that make the host ill. 2. Viruses on the other hand enter into individual cells of the hosts body and then hijack th...