Letter H

Human herpesvirus 1 (HHV-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 HHV-1:</P> NTER><IMG alt='fever blister' src='http://images.medicinenet.com/images/Feverblister.GIF'></CENTER> In rare cases, as when the immune system is severely compromised, this virus can cause infection of the brain (encephalitis).

HHV-1 is also known as herpes simplex type .

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