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Sir.—Dr Shaw's letter advocating deletion of the term fifth disease on the basis that there is no fourth disease is contradicted by the complement system numeration that dictates that there is no relationship between numbers as we know them.
KEITER WE. First Through Sixth Diseases-Reply. Am J Dis Child. 1978;132(4):433. doi:10.1001/archpedi.1978.02120290105031