1. Bureau of Epidemiology, Office of Surveillance and Public Health Preparedness, Houston Department of Health and Human Services, Houston, TX, USA
2. Institute of Community Health, University of Houston College of Pharmacy, Texas Medical Center, Houston, TX, USA
3. Infectious Diseases Section, Michael E. DeBakey VA Medical Center, Houston, TX, USA
4. Department of Medicine, Baylor College of Medicine, Houston, TX, USA
5. Department of Internal Medicine, Division of Infectious Diseases, University of Texas Health Science Center, Houston, TX, USA
6. Legacy Community Health Services, Montrose Campus, Houston, TX, USA