The term "Fifth disease" does not refer to someone named "Fifth", but rather to the fifth of six classic exanthems, or rash associated diseases, of childhood. The numbering is of historic interest only: the other exanthems, in order, are first: "measles"; second: "scarlet fever"; third: "rubella"; fourth: "Dukes' disease", which was never clearly distinguished from other rash-producing diseases and is now thought to have been either measles or rubellla, scarlet fever, a Staphylococcal infection, or one of several unspecified enteroviral infections; and sixth: "roseola".