[1] Michigan State University,Department of Microbiology and Molecular Genetics
[2] University of Michigan Medical School,Department of Internal Medicine/Infectious Diseases Division
[3] University of Michigan Medical School,Unit for Laboratory Animal Medicine and Department of Microbiology and Immunology
[4] University of Michigan Medical School,Department of Internal Medicine/Pulmonary Division
[5] University of Michigan,Department of Microbiology and Immunology
[6] University of California San Francisco,Department of Medicine, Division of Gastroenterology
[7] Howard University,Department of Biology