Letter H

Herpes simplex type 1

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A herpes virus that causes cold sores and fever blisters in and around the mouth.

Here is a depiction of a typical fever blister caused by herpes simplex 1:</P> NTER><IMG height=363 alt='Fever blister Illustration - Herpes simplex type ' src='http://images.medicinenet.com/images/illustrations/fever_blister.jpg' width=272></CENTER> In rare cases, as when someone's immune system is severely compromised, this virus can cause infection of the brain (encephalitis).</P> Herpes simplex type 1 is also known as human herpesvirus 1 (HHV-1).

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