In making the diagnosis, the doctor examines the affected person's eyes, ears, nose, and throat in order to rule out other diseases that may cause fever and sore throat, such as infectious mononucleosis, a sinus infection, or strep throat.
Since both bacterial and viral sore throat are contagious and pass easily from person to person, the doctor will seek information about whether the patient has been around other people with flu, sore throat, colds, or strep throat.
Apart from minimizing a child's exposure to strep throat and similar upper respiratory infections, there is nothing that parents can do to prevent vasculitis in children, in that the cause(s) of these disorders are still unknown.
Besides other varieties of strep organisms, these organisms may include Candida albicans, which can cause thrush; Corynebacterium diphtheriae, which can cause diphtheria; and Bordetella pertussis, which can cause whooping cough.
Once it is clear that no pneumonia, ear infection, strep throat, or other common childhood illness is present, the practitioner usually feels comfortable waiting to see if the characteristic rash of roseola begins.