What type of pathogen causes genital herpes?

A virus. However, very few outbreaks or sores thought to be caused by the herpes virus actually test positive for the herpes virus. If a sore or outbreak does not test positive in a culture test or swab test it is impossible to diagnose the OB as viral.

A person test positive for herpes by testing positive for the IgG antibody. It is possible that a fungal infection could cause an elevated IgG count therefore causing a person to test positive for herpes.

Genital Herpes is a virus, but outbreaks may be fungus.
No herpes is a virus.
Genital herpes is a sexually transmitted disease (STD) caused by the herpes simplex viruses type 1 (HSV-1) or type 2 (HSV-2). Most genital herpes is caused by HSV-2. Most individuals have no or only minimal signs or symptoms from HSV-1 or HSV-2 infection. When signs do occur, they typically appear as one or more blisters on or around the genitals or rectum. The blisters break, leaving tender ulcers (sores) that may take two to four weeks to heal the first time they occur. Typically, another outbreak can appear weeks or months after the first, but it almost always is less severe and shorter than the first outbreak. Although the infection can stay in the body indefinitely, the number of outbreaks tends to decrease over a period of years.