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FIGURE 4.10 Cases of measles in the United States by year. The most recent epidemic of measles, in 1989-1991, was probably due to vaccine failure and waning immunity in children immunized earlier with only a single dose of vaccine. In 1998, a total of 100 cases of measles was reported, a 27% decrease from the previous record low of 138 cases in 1997. Of these 100 cases, 71% came from international importation. [From Summary of Notifiable Diseases in the United States for 1998. MMWR 47; No. 53, p. 48 (1999).]

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