I posted a topic about few days ago about hair loss and scratching. I got to really checking out my rats fur and found little bugs. I'm not sure what mites look like, I was told they aren't visible. So it's most likely that my little guys have lice? I did put revolution on them. What are possibilities on how they got em? Do I need to throw out their wood house? transmittable to humans? Powder treatment is safe? Thanks in advance for the info.