There are over eighty different types of viruses, but this course will include only those listed below. Many of these viruses originate in the mouth and then spread to other parts of the body. Between eighty to ninety percent of the population has type 1 Herpes Simplex virus in their body. Upon completion of this course you will have a better understanding what herpes simplex is and how to better diagnosis it. You will also know the difference between a herpes infection and a canker sore.