Location and Place of Birth

California, New York, Florida, and Texas accounted for 48% of all TB cases in 2006, reflecting the high immigration rates into these states.4 TB is most prevalent in large urban areas, exacerbated by crowding in poor immigrant neighborhoods, where 57% of all U.S. cases were found in 2006. ,4 Mexico, the Philippines, Vietnam, India, China, Haiti, Guatemala, and South Korea account for the largest numbers of these immigrants.4 Those in close contact with patients with active pulmonary TB are most

likely to become infected. ' These include family members, coworkers, or coresid-ents in places such as prisons, shelters, and nursing homes.

Race, Ethnicity, Age, and Gender

In the United States, the incidence of TB is more concentrated in nonwhite individuals. In 2007, non-Hispanic blacks accounted for 26% of all TB cases, followed by Hispanics at 29%.5 Asians and Pacific Islanders accountedfor 26%, whereas non-Hispanic whites accounted for only 17% of the new TB cases5 TB is most common among people 25 to 44 years of age (32% of all cases), followed by those 45 to 64 years of age (30%) and 65 or more years of age (19%).

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