I found this article on Scarlet Fever: http://www.mayoclinic.com/health/scarlet-fever/DS00917.

It sounds almost like Mono. I had Scarlet Fever when I was around 5 years old. I also had many bouts of Strep over the years. Mono at 19, Chicken Pox at 25. Then about six months before I was dx with MS (2005) I had back to back severe Bronchitis. I was tired and run down as both my parents passed away within 2 months of each other (January and March 2005). I think my immune system was just kaput.