@alFredo - Yes, I do know a couple of other sicknesses Acyclovir has been used to treat. One sickness Acyclovir has been used to treat is the measles virus; the other, autism.
When I read about the latter illness, autism, I was surprised to see they have even tried Acyclovir to try to treat it. Studies have found, for both measles and autism, that there is no link between the Acyclovir and the treatment of either.
In rare cases of both these diseases there seemed to be a correlation between Acyclovir with the treatment of measles and autism, but when looked at further it was found to be a mere coincidence.