Differential decline in tuberculosis incidence among US- and non-US-born persons in New York City.

SETTING

A large urban tuberculosis control program.

OBJECTIVES

To examine changes in tuberculosis incidence and characteristics of cases in New York City (NYC), and assess the epidemiology of tuberculosis among non-US-born persons.

DESIGN

Tuberculosis surveillance data (1995-1999) for NYC were analyzed.

RESULTS

Tuberculosis incidence decreased by 56.6% in US-born and 19.6% in non-US-born persons (age-adjusted) over the study period. The decline in tuberculosis incidence among US-born persons was more substantial in the first half of the study period (23-24%) than in the second half (13-15%). The greatest decline in incidence was among US-born Hispanic or Black males aged 25-64. However, although there was an overall decline in incidence among non-US-born persons, there was no significant change in any sex or racial/ethnic subgroup. The percent of multidrug-resistant (MDR) cases among non-US-born patients remained stable, but recent arrivals accounted for 79% of non-US-born MDR-TB patients in 1999, a significant increase from 16% in 1997.

CONCLUSIONS

Continuing current tuberculosis control efforts and treatment of immigrants with latent tuberculosis infection are of highest priority for reducing incident cases in NYC. Global collaboration towards earlier detection and treatment of active tuberculosis cases in high incidence countries is also essential.