Actually, this page does refer to multiple strains of genital herpes, it's just not terribly clear. Studies have shown that a person with genital herpes can catch a new case of genital herpes, but other studies have shown that this happens only rarely. In most cases, if a person with genital herpes catches genital herpes while with a partner, they are catching it from themselves - having a recurrence. Type-specific antibody against your own strain of virus makes it very difficult to catch a second infection of the same strain from a different person.
This Harvard study also discusses different HSV-2 strains and possible resulting anti-viral resistance: http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=154092
I would be surprised to find out that there aren't many different sub-strains of such a common virus.
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Studies have shown that a person with genital herpes can catch a new case of genital herpes, but other studies have shown that this happens only rarely. In most cases, if a person with genital herpes catches genital herpes while with a partner, they are catching it from themselves - having a recurrence. Type-specific antibody against your own strain of virus makes it very difficult to catch a second infection of the same strain from a different person.
This Harvard study also discusses different HSV-2 strains and possible resulting anti-viral resistance:
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=154092
I would be surprised to find out that there aren't many different sub-strains of such a common virus.