Actually a lot of illnesses can be spread from human to animal and animal to human, and they don't always become the same thing when they are spread. Say for instance we have a cold. It might not be deadly to us, but when transferred to a primate or a bird it can be lethal. Or there is a strain of herpes that monkeys can get which is fine for them, but are incredibly dangerous for humans. It is the same virus, but presents itself in different ways in different species. I don't know the affects of our illnesses on sugar gliders, but I would say to stay away from them when you are sick for a few days. Why chance it? Especially with something as big as mono. Make sure you wash your hands well when preparing food and before handling them. Those are just my suggestions.