Jean-Luc came into our home summer of 2004 with his brother, Logan. They had some problems, namely lice, so I took them to the vet. The vet gave them Ivermectin shots and since the shot neight of them grew. They were only about 2.5 months old and not fully grown. Logan died last xmas when Spike died. It was a very sad day in my home. Jean-Luc's health hasn't been that great since. Don't ever let a vet give your rats Ivermectin injections. A better way is to go to a animal supply store and get the Ivermectin paste for horses. Use a tiny amount for conditioner every 2 weeks for 2 months and the lice are gone. And none of the tradgic side effects.
This is a photo of Jean-Luc and his brother Logan when they were both happy and healthy babies.