Extrapulmonary tuberculosis in the United States

Area of Science:

• Epidemiology
• Infectious Diseases
• Public Health

Background:

• Tuberculosis (TB) incidence in the US has decreased, primarily driven by reductions in pulmonary TB cases.
• Extrapulmonary TB cases have remained relatively constant, suggesting different epidemiological trends.
• Understanding extrapulmonary TB is crucial for comprehensive disease control strategies.

Purpose of the Study:

• To analyze the epidemiological characteristics of extrapulmonary tuberculosis.
• To compare extrapulmonary TB with pulmonary TB regarding patient demographics and diagnostic methods.
• To identify variations in extrapulmonary TB across different anatomic sites.

Main Methods:

• Retrospective survey of reported extrapulmonary tuberculosis cases.
• Analysis of demographic data including sex, race, and age distribution.
• Comparison of physician specialties and bacteriological confirmation rates between pulmonary and extrapulmonary TB.

Main Results:

• Extrapulmonary TB exhibits different sex and race distributions compared to pulmonary TB.
• Significant variations exist in physician specialties diagnosing extrapulmonary TB.
• The proportion of bacteriologically confirmed cases differs between pulmonary and extrapulmonary TB.
• Extrapulmonary TB shows site-specific variations in age distribution and other characteristics.

Conclusions:

• Extrapulmonary tuberculosis presents distinct epidemiological features compared to pulmonary tuberculosis.
• Significant heterogeneity exists within extrapulmonary TB based on anatomic site.
• The unexplained nature of these epidemiologic differences warrants further investigation.