<P> Herpesviridae is a large family of DNA viruses that cause diseases in animals, including humans . The members of this family are also known as herpesviruses . The family name is derived from the Greek word herpein ("to creep"), referring to the latent, recurring infections typical of this group of viruses . Herpesviridae can cause latent or lytic infections . </P> <P> At least five species of Herpesviridae--HSV - 1 and HSV - 2 (both of which can cause orolabial herpes and genital herpes), varicella zoster virus (the cause of chickenpox and shingles), Epstein--Barr virus (implicated in several diseases, including mononucleosis and some cancers), and cytomegalovirus--are extremely widespread among humans . More than 90% of adults have been infected with at least one of these, and a latent form of the virus remains in most people . </P> <P> There are 9 herpesvirus types known to infect humans: herpes simplex viruses 1 and 2, HSV - 1 and HSV - 2, (also known as HHV1 and HHV2), varicella - zoster virus (VZV, which may also be called by its ICTV name, HHV - 3), Epstein--Barr virus (EBV or HHV - 4), human cytomegalovirus (HCMV or HHV - 5), human herpesvirus 6A and 6B (HHV - 6A and HHV - 6B), human herpesvirus 7 (HHV - 7), and Kaposi's sarcoma - associated herpesvirus (KSHV, also known as HHV - 8). In total, there are more than 130 herpesviruses, some of them from mammals, birds, fish, reptiles, amphibians, and mollusks . </P> <P> There are antiviral drugs that are effective against some kinds of herpesvirus . </P>

How many strains of hsv 1 are there
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