There are two common strains of the herpes simplex virus, called HSV-1 and HSV-2. Both can cause genital sores, and both can be transmitted sexually. Here are s

There are two common strains of the herpes simplex virus, called HSV-1 and HSV-2. Both can cause genital sores, and both can be transmitted sexually. Here are some facts: http://www.who.int/mediacentre/factsheets/fs400/en/ http://www.who.int/mediacentre/factsheets/fs400/en/