Dukes' disease or fourth disease is an exanthem.

It was never associated with a specific pathogen, and the terms "fourth disease" and "Dukes' disease" are rarely used today.

Fourth disease, a condition whose existence is not widely accepted today, was described in 1900 and is postulated to be related to Staphylococcus aureus.

The fourth disease treatable by Gleevec is a proliferation of certain white blood cells, known as eosinophils, that specialize in attacking worms and other parasites.

SARS is made only the fourth disease, after plague, yellow fever, and cholera, that countries are required to report to the World Health Organization.

Measles was first disease, scarlet fever was second disease, rubella was third disease, a nondisease called Duke's disease was fourth disease, and roseola was sixth disease.