There are two main types of Herpes Simplex Virus (HSV), 1 and 2. The primary difference between the two types is in where they typically establish latency in the body. HSV1 usually establishes latency in the trigeminal ganglion, a collection of nerve cells near the ear. From there, it tends to recur on the lower lip or face causing cold sores. HSV2 usually resides in the sacral ganglion at the base of the spine. From there, it recurs in the genital area but even this difference is not absolute as in rare cases it can infect any part of the body, including the eyes. Up to 30% of genital herpes are also caused by HSV1. Both HSV1 and 2 are highly contagious through contact.