Annual incidence rates for perinatal AIDS. 1996, by state.

SOURCE: calculated from CDC. 1996b; Ventura et al., 1998.

area. These two MSAs alone account for 38% of all perinatal AIDS cases in the United States. Data on the distribution of AIDS cases within New York City suggest that the concentration varies substantially by neighborhood (NRC, 1993), and this patchwork pattern is likely to be found for perinatal AIDS cases as well.

Perinatal transmission cases are similarly less common in most metropolitan areas. Out of the 253 MSAs for which AIDS data are available, only 66 (26%) have had more than ten reported perinatal cases from the beginning of the epidemic through the end of 1996. Only 24 MSAs (9%), have 50 or more cumulative cases each.

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