Second disease
Scarlet fever (second disease) is a bacterial illness (GABHS) that often presents as diffuse erythematous rash in the setting of a sore throat (streptococcal pharyngitis)
Tag numbered diseases
Sixth disease
Roseola infantum (exanthem subitum) is a viral illness that mostly affects infants and toddlers. Differentiated from other common paediatric rashes as sixth disease
John Zahorsky
John Zahorsky Jr (1871-1963) was an Austro-Hungarian born American pediatrician. Early description of roeola infantum (sixth disease) and herpangina
Henry Koplik
Henry Koplik (1858 – 1927) was an American pediatrician. Eponymously affiliated with Koplik spots of measles first described in 1896