University of California, San Francisco (UCSF) - Department of Microbiology and Immunology, University of California, San Francisco (UCSF) - Department of Microbiology and Immunology, University of California, San Francisco (UCSF) - Department of Microbiology and Immunology, Gladstone Institutes, University of California, San Francisco - Division of Gastroenterology and Hepatology, University of California, San Francisco - Department of Medicine, Gladstone Institutes, University of California, San Francisco - Division of Gastroenterology and Hepatology and University of California, San Francisco (UCSF) - Department of Microbiology and Immunology