Can't say why there isn't, although grace has posted about this before. It would be groundbreaking in the medical field if there were such a thing, given that herpes is transmitted very often through shedding.
Do you realize that even a regular swab/culture to detect the herpes virus takes days to culture in a lab? I'm sure that very well has something to do with it.
why not? it would seem a logical way to help prevent the spread of the disease.