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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 .

fever blister

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=11496
Last Editorial Review: 6/14/2012

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