Roseola is: a viral illness. It is not contagious once the symptoms develop but is before they do so it is difficult to stop spread. It lasts about a week at the most. It is caused by a virus called human herpes virus 6 and another variant HHV 7. These are in the class of Herpes viruses buy do not cause cold sores or other herpes lesions. Once infected you develop antibodies which destroy the virus.
Answered 5/16/2015
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