Traditional Childhood Exanthems
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þ The name "fifth disease" is not typically capitalized, since the name derives 
  from its historical classification as the fifth of the classical childhood 
  skin rashes or exanthems. Their classification is as follows:

    Measles
    Scarlet fever
    Rubella
    Duke's disease
    fifth disease (erythema infectiosum)
    Roseola

þ Dukes' disease or fourth disease is an exanthem.
 - It is named after Clement Dukes.
 - Some of these eruptions are characteristic of the causative virus, 
   but in most cases one must be satisfied with the diagnosis of viral rash.
 - It was never associated with a specific pathogen,[3] and the terms 
   "fourth disease" and "Dukes' disease" are rarely used today.
 - In 1979 Keith Powell proposed equating it with the condition currently 
   known as Staphylococcal scalded skin syndrome.