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Nina T. Harawa, PhD, MPH, Trista A. Bingham, MPH, MS, Susan D. Cochran, PhD, Sander Greenland, DrPH and William E. Cunningham, MD, MPH

Nina T. Harawa and Trista A. Bingham are with the Los Angeles County Department of Health Services, HIV Epidemiology Program. Susan D. Cochran and Sander Greenland are with the University of California at Los Angeles School of Public Health, Department of Epidemiology. William E. Cunningham is with the University of California at Los Angeles School of Public Health, Department of Health Services.

Correspondence: Requests for reprints should be sent to Nina T. Harawa, PhD, MPH, HIV Epidemiology Program, 600 South Commonwealth Ave, Suite 1920, Los Angeles, CA 90005-4001 (e-mail: nharawa{at}dhs.co.la.ca.us).

Objectives. We examined differences in HIV seroprevalence and the likely timing of HIV infection by birth region.

Methods. We analyzed unlinked HIV antibody data on 61 120 specimens from 7 public health centers in Los Angeles County from 1993 to 1999.

Results. Most (87%) immigrant clients were Central American/Mexican–born. HIV prevalence was similar for US- and foreign-born clients (1.8% [95% confidence interval (CI) = 1.7%, 1.9%] and 1.6% [95% CI = 1.5%, 1.8%], respectively). Seroprevalence was high among sub-Saharan African females and low among Asian/Pacific Islander males and females. For HIV-positive immigrants, the average age at and time since immigration were 20.6 years and 12.3 years, respectively.

Conclusions. The relatively young age at arrival and long time since arrival for HIVpositive foreign-born clients suggest that most were infected after immigration.

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