1. The estimated number of adults and adolescents living with AIDS in each region of the 50 states and the District of Columbia increased from 1993 through This increase is due primarily to the widespread use of highly active antiretroviral therapy, introduced in 1996, which has delayed the progression of AIDS to death.
At the end of 2006, an estimated 177,075 (41%) of adults and adolescents living with AIDS resided in the South, 125,294 (29%) in the Northeast, 86,339 (20%) in the West, 46,871 (11%) in the Midwest.
The data have been adjusted for reporting delays.
Regions of residence are defined as follows:
Northeast—Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont
Midwest—Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin
South—Alabama, Arkansas, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia
West—Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming