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At the end of World War II in 1945, there existed the National Institute [singular] of Health and the National Cancer Institute. In 1946, Congress began creating new institutes by authorizing a National Institute on Mental Health (which was not given operating funds until 1949). In 1948, the Surgeon General reorganized the existing NIH divisions into two institutes: the National Microbiological Institute, comprising work on infectious diseases, zoological diseases, and biologics; and the Experimental Biology and Medicine Institute, which subsumed work in chemistry, pharmacology, and nutrition. In 1948, Congress created a National Institute of Dental Research, in part as a response to the impact bad teeth had made on the fitness for military service of young men; and a National Heart Institute, whose legislation included wording that made the umbrella organization’s name plural: National Institutes of Health.

These six institutes had grown to 15 by 1969, to 25 by 1999, and to 27 by 2001.