Definition of Human herpesvirus 1 (HHV-1)
Human herpesvirus 1 (HHV-1): 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:
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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Last Editorial Review: 6/14/2012
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