Some viruses such as measles and herpes simplex may reach the lungs via the blood.

Well, we just put basically all the human respiratory viruses on one chip, and we threw in herpes virus for good measure I mean, why not?

Another consideration is that different strains of a herpes virus can have different characteristics which may result in differences in the precise effects of the virus.

It should not be used while wearing contact lenses, during eye infections or in people with a history of herpes virus infections.