Has anyone's baby been diagnosed with the Roseola Virus? DD was just in the hospital yesterday after having a high fever for 4 days and then getting a full body rash. I was told she has Roseola and that the rash will go away in a few days. Apparently she had some severe symptoms too that aren't common. She was vomiting had diarrhea and was sleeping about 20 hours a day. All of that lead to dehydration and she had to get IV fluids. Is this virus common, do I have to worry about her getting it again, and if your child had it how long did the rash last on them and how much of their body did it cover?