Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. One of the most common viruses in humans are the herpes simplex virus 1 and 2. Symptoms of herpes simplex virus infection include watery blisters in the skin or mucous membranes of the mouth, lips or genitals. Sometimes, the viruses cause very mild or atypical symptoms during outbreaks. persist in the body by becoming latent and hiding from the immune system in the cell bodies of neurons. After the initial or primary infection, some infected people experience sporadic episodes of viral reactivation or outbreaks. Learn more about the herpes simplex viruses, their types, and effects on human health in this book.