Virus, herpes simplex 1 and 2 (HSV-1,HSV-2), the most important virus disease-causing, human. Herpes simplex virus 1, the cause of herpes lips and herpes simplex virus 2, causing genital herpes can be. These viruses are very common and contagious. HSV-1 via infected saliva transferred, but HSV-2 through sexual contact, transmission can't find. The genome of the virus to form the linear DNA two-strand. Virus to figure 20 is faceted and has a cover () lipid tangles. Scratch the skin, thereby transferring the virus to the skin. Healthy skin prevents penetration of the virus into the body. This virus, the nerve cells to the infected area, and may be generally hidden neurons to the mode of dormant ends. The effect of stimulation, such as stress and emotional, the virus from the dormant to the active mode comes in. Virus through the axon of the nerve to the skin returns and there reproduce, find and create the herpes. Virus herpes simplex can areas a variety of the body, the contaminated formation, such as create lesions in the mouth and throat, inflammation of the cornea and conjunctiva of the eye (), etc. herpes skin, and .