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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.

The viruses are called herpes simplex virus type 1 hsv 1 and herpes simplex virus type 2 hsv 2. Herpes type 1 hsv 1 or oral herpes and herpes type 2 hsv 2 or genital herpes. Radical Vaccine Design Effective Against Herpes Viruses Hhmi Org These viruses look identical under the microscope and either type can infect the mouth or genitals.