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Editor's Reply: Dr. Papermaster's curiosity was undoubtedly aroused by a paper (Greenwald, P., and Bashe, W. J., Jr.: An Epidemic of Erythema Infectiosum, Amer J Dis Child 107:30, 1964) in the January issue of the Journal. Since many others among our readers must have asked themselves the same question it was a pleasure to do some digging in the archives of the past. In the first edition of his textbook on Infectious Diseases published in 1909, Claude Buchanan Ker asserted that certain old theories which held that rubella was either measles or scarlatina in modified form could no longer be entertained. Rubella was clearly a third and distinct disease. Whether measles or scarlet fever merited the dubious distinction of being number one is not clear. The fog was beginning to dissolve but much remained to cause confusion. Filatoff, in 1887, had described an apparently different anomalous exanthem under the title
Shaw HLK. FIRST, SECOND, THIRD, FOURTH, AND FIFTH DISEASES-Reply. Am J Dis Child. 1964;108(4):440. doi:10.1001/archpedi.1964.02090010442018