1. Division of Global Public Health, Department of Medicine, University of California, San Diego, San Diego, California, USA
2. San Diego County Tuberculosis Control Program, San Diego, California, USA
3. Border Infectious Disease Surveillance Program, California Department of Public Health, San Diego, California, USA
4. Comité Estatal de Farmacorresistencia, Instituto de Servicios de Salud Pública del Estado de Baja California, Mexicali, Mexico