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Cold sores are caused by herpes simplex virus. Signs and symptoms of herpes infection. Herpesviruses Herpes Simplex I Ii Cold Sores Genital Herpes Herpes simplex virus 1 and 2 hsv 1 and hsv 2 also known as human herpesvirus 1 and 2 hhv 1 and hhv 2 are two members of the human herpesviridae family a set of viruses that produce viral infections in the majority of humans.

Genital herpes is caused by one of the herpes simplex viruses hsv. The protein first evolved around 400 million years ago which is also roughly when the herpes virus family first appeared. View Of The Herpes Simplex Virus Hsv Family Of The Herpesviridae There are two types hsv 1 and hsv 2.