1. Center for Genes, Environment and Health, National Jewish Health, Denver, CO 80206, USA
2. Mycobacteria Research Laboratories, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523, USA
3. Mycobacteriology and Pharmacokinetics Laboratories, National Jewish Health, Denver, CO 80206, USA
4. Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE 68198, USA
5. Present address: Wyoming Department of Health, Wyoming Public Health Laboratory, Cheyenne, WY 82002, USA.
6. Infectious Diseases Section, University of Nebraska Medical Center, Omaha, NE 68198, USA