Michael Melia, MD – Fellowship Program Director
Dr. Melia is an Associate Professor of Medicine in the Infectious Diseases (ID) Division at Johns Hopkins. He has been the director of the Johns Hopkins ID Fellowship Training Program since July 2015 after having served as the associate director beginning in January 2010, and he served as the Chair of the IDSA training program director’s committee since October 2019. He is the current Chair of the IDSA Medical Education Community of Practice ID Week Workgroup. He is also associate director of the Osler Medical Housestaff Training Program, focusing on faculty engagement and housestaff couching.
He is a passionate educator and works with learners at multiple stages of training. Dr. Melia is clinical active in both the inpatient and outpatient arenas for both the “general infectious diseases” and HIV services. He spends the majority of his research efforts engaged in medical education research. His clinical research interests include Lyme disease, Norcardia infections, and viral hepatitis. Melia Research Dashboard and Publications
Natasha Chida, MD, MSPH – Fellowship Program Associate Director
Dr. Chida is an Assistant Professor of Medicine in the Division of Infectious Diseases at the Johns Hopkins University School of Medicine and is Associate Director of the Infectious Diseases fellowship training program. She first came to Hopkins as a fellow in infectious diseases in 2012, after which she joined the faculty. She is passionate about working with physicians in training and future physicians. Her research interests are focused in graduate medical education, and she has a particular interest in career development for trainees and bias in medical education. She is the Co-Director of the Osler and Bayview Medical Housestaff Education Pathway, is Barker firm faculty in the Osler Medical Housestaff Training Program, and serves as a firm resident coach. She maintains an outpatient practice in HIV care, precepts in resident internal medicine clinic, and attends on the inpatient services for general ID, the inpatient HIV service, and internal medicine. Chida Research Dashboard and Publications
Mamuka Machaidze, MD – Fellowship Program Assistant Director
Dr. Machaidze is an Assistant Professor of Medicine in the Division of Infectious Diseases at the Johns Hopkins University School of Medicine, as well as Assistant Director of the Infectious Diseases fellowship training program for Johns Hopkins Bayview Hospital. He earned his M.D. from the David Tvildiani Medical University (Tbilisi, Country of Georgia), completed an Internal Medicine Residency at Emory University and Infectious Diseases Fellowship at New York University Hospital.
Dr. Machaidze joined Hopkins faculty in 2019. He is passionate about working with residents and students during inpatient Infectious Disease consult service. His research interests are focused on Phage therapy for resistant pathogens, as well as Non-Tuberculous Mycobacteria. He is involved and the Medical Housestaff Education and percepts Internal Medicine Residents in the general ID clinic at Bayview outpatient clinic.
Sara Cosgrove, MD, MS, FSHEA, FIDSA – Chair of the Fellowship Research Review Committee & PI of the Fellowship Program T32 Grant (Research Training in Microbial Diseases); Medical Director of the Johns Hopkins Hospital Department of Antimicrobial Stewardship
Dr. Cosgrove is a Professor of Medicine and Epidemiology at Johns Hopkins University School of Medicine. She serves as the Chair of the Fellowship Research Guidance Committee and is the PI of the T32 Fellowship Training Grant, “Research Training in Microbial Diseases,” that is funded by the National Institute of Allergy and Infectious Diseases. Dr. Cosgrove is Medical Director of The Johns Hopkins Hospital Department of Antimicrobial Stewardship. Her research interests include epidemiology and outcomes of antimicrobial resistance, development of tools and programs to promote rational use of antimicrobials, prevention of hospital-acquired infections and epidemiology and management of S. aureus bacteremia. She is a voting member of the Presidential Advisory Council on Combating Antibiotic Resistant Bacteria and is a past-president of the Society for Healthcare Epidemiology’s Board of Directors.
Dr. Cosgrove’s research interests include epidemiology and outcomes of antimicrobial resistance, development of tools and programs to promote rational use of antimicrobials, prevention of hospital-acquired infections and epidemiology and management of S. aureus bacteremia. Cosgrove Research Dashboard and Publications
Joel Blankson, MD, PhD – Co-chair of the Fellowship Research Review Committee & Co-PI for the Fellowship Program T32 (Research Training in Microbial Diseases grant)
Dr. Blankson is a Professor of Medicine at Johns Hopkins University School of Medicine, Division of Infectious Diseases. Alongside Dr. Cosgrove, Dr. Blankson also serves as the Co-chair of the Review Committee and the Co-PI of the T32 Fellowship Training Grant, “Research Training in Microbial Diseases,” that is funded by the National Institute of Allergy and Infectious Diseases.
He is an expert on HIV infection, particularly HIV latency and long-term control of HIV infection. Dr. Blankson is a lead investigator in studies on these topics and is frequently interviewed in the scientific and popular press. He also practices internal and infectious disease medicine. Blankson Research Dashboard and Publications
Additional Core Faculty
Our division consists of more than 100 faculty members, many of whom work closely with our fellows on the wards and as research mentors. The following are examples of our wonderful faculty who are dedicated to nurturing the clinical skills and professional development of our fellows.
Dr. Paul Auwaerter is the Sherrilyn and Ken Fisher Professor of Medicine at the Johns Hopkins University School of Medicine. Areas of particular clinical focus include tickborne diseases including Lyme disease, Epstein-Barr virus infections and fevers of unknown origin.
Dr. Auwaerter serves as the Clinical Director of the Division of Infectious Diseases. He is also the director of the Fisher Center for Environmental Infectious Diseases, the Executive Director for the Point of Care-Information Technology (POC-IT) Center and Editor-in-Chief of the Johns Hopkins Antibiotic Guide. He earned his M.D. from the Columbia University College of Physicians and Surgeons.
His research interests include tick-borne diseases and point of care information technology. Dr. Auwaerter serves on the Promotions Committee for the Johns Hopkins Department of Medicine. He was recognized with a Healthnetworks Service Excellence Award in 2014. He is a member of the American Society of Microbiology (ASM) and the Infectious Diseases Society of America (IDSA), serving as President of the IDSA 2017-2018. Auwaerter Research Dashboard and Publications
Dr. Robin Avery is an infectious disease physician who joined the Johns Hopkins faculty in 2012, with two decades of experience in transplant infectious disease. She is a past chair of the American Society of Transplantation (AST) Infectious Disease Community of Practice; was a co-editor of the first edition of the AST ID Guidelines; and has served on guidelines committees for the AST, the Infectious Disease Society of America (IDSA) and the International Society for Heart and Lung Transplantation (ISHLT), as well as the Centers for Disease Control and Prevention Zoster Vaccines Workgroup. She was the founding head of the Transplant Infectious Disease Section at the Cleveland Clinic and the founding director of the Cleveland Clinic Transplant ID Special Fellowship, authoring a curriculum that served as the basis for curricula later endorsed by the AST and IDSA.
Her clinical and research interests include pre-transplant donor and recipient evaluation, and prevention and treatment of post-transplant infections, particularly transplant-associated viruses, viral load monitoring, novel therapies for CMV, hypogammaglobulinemia, immunizations, patient education, and strategies for safer living post-transplant. In 2017, Dr. Avery received the award for Best Consulting Physician at the Johns Hopkins Hospital. Avery Research Dashboard and Publications
Dr. Kelly Gebo is a graduate of The Johns Hopkins University School of Medicine. She also earned an MPH in Epidemiology from The Johns Hopkins Bloomberg School of Public Health. She completed residency training in Internal Medicine at The Johns Hopkins Hospital followed by two years of fellowship training as a Robert Wood Johnson Clinical Scholar in the Department of Medicine, also at Hopkins. Her clinical and research interests include evidence based practice, health disparities in access to care, health utilization, HIV and aging, hepatitis, outcomes research, and policy generation.
Dr. Gebo is affiliated with The Johns Hopkins Center for Global Health, Reducing Global Inequities in Burden of Disease, where she has translated individual patient care to larger global health issues. As part of a multidisciplinary group in Baltimore, she has been closely involved with mentoring students interested in global health issues as it relates to infectious diseases. She worked closely with students engaged in research projects such as Cancer in the Hopkins HIV Cohort in the Era of HAART and the Impact of Illicit Drug Use and Substance Abuse Treatment on HAART Adherence. Her work with HIV in the Elderly Population was recently supported by an RO1 Research Grant from the National Institute on Aging, entitled “Clinical Outcomes in Elderly HIV Patients.” A pilot grant in 2003 provided funds for her to study National Trends in HIV+ Hospitalizations 1996-2000. In 2018, Dr. Gebo accepted a position as Chief Medical and Scientific Officer for the NIH All of Us Research Program where she will work with key stakeholders to lead the program’s scientific agenda, guide protocol revisions and data collection processes, and provide clinical oversight. Dr. Gebo has authored or co-authored more than forty-two publications. Gebo Research Dashboard and Publications
Stuart C. Ray, MD, FACP, FIDSA serves as Vice Chair of Medicine for Data Integrity and Analytics and is a Professor in the Division of Infectious Diseases within the Department of Medicine, with secondary appointments in Viral Oncology and Health Sciences Informatics. He is Scientific Director of the JHU Laboratory for Integrated NanoDiagnostics, directs the virology laboratory and is a clinical investigator in the Center for Viral Hepatitis Research in the Division of Infectious Diseases. He is a faculty member of the Graduate Immunology program, the Graduate Pharmacology program, and of the Janeway Firm of the Osler Medical Service.
Dr. Ray received his M.D. from Vanderbilt University School of Medicine in 1990. After an internship and residency at Johns Hopkins Hospital, he continued there as an Assistant Chief of Service and fellow in Infectious Diseases. During his fellowship, he studied the immunology and sequence variation of HIV in the laboratory of Dr. Robert Bollinger. During that time, he developed an interest in HIV sequence variation during antiretroviral therapy in a productive collaboration with Dr. Robert Siliciano that continues to the present.
In 1997, Dr. Ray joined the Johns Hopkins faculty, and under the mentorship of Dr. David Thomas shifted his primary research focus to hepatitis C virus (HCV). His laboratory work has focused on the sequence variation of HCV during acute and chronic infection, developing and applying computational and molecular biology tools to underlying mechanisms including stochastic variation, immune selection, and viral fitness. He continues to care for patients with HIV, HCV, and other infectious diseases. Ray Research Dashboard and Publications
The Sears laboratory studies how the microbiota and specific bacteria induce colon carcinogenesis. We integrate studies in humans and mouse models (including germ-free mice) employing microbiology, bioinformatics and immunologic methods to seek to achieve our goals to understand disease mechanisms and to develop new approaches to disease prevention. We study the bacterium, enterotoxigenic Bacteroides fragilis (ETBF) as a model for inducing colon inflammation and carcinogenesis. Using in vivo murine models, we identified that ETBF contributes to colon tumorigenesis through secretion of BFT (B. fragilis toxin), activation of STAT3 and NF-κB as well as induction of mucosal IL-17. In humans, most colon cancer patients have evidence of ETBF colonization and nearly 50% of individuals with sporadic colon cancers as well as individuals with hereditary colon cancer display carcinogenic biofilms.
Active projects in the laboratory include determining the epidemiology of colon biofilm formation in a 2000 person prospective colonoscopy cohort; understanding how biofilms form on mucosal surfaces and induce disease; addressing mechanisms by which bacterial virulence factors induce carcinogenic DNA alterations; defining which microbiota members or communities induce mucosal carcinogenesis and IL-17; and identifying how the colon microbiome and its members impact cancer immunotherapy responses in humans. Sears Research Dashboard and Publications
Dr. David Lee Thomas is the Director of Infectious Diseases and the Stanhope Bayne-Jones Professor of Medicine in the Division of Infectious Diseases. Dr. Thomas’ primary research interests are in hepatitis viruses. He has long-standing, NIH-funded programs to investigate the host genetic basis for differences in the outcome of hepatitis C virus infection and to explore the impact of HIV on liver disease in persons with chronic viral hepatitis. Questions about elimination of hepatitis C virus infection from persons who inject drugs are especially timely.
Dr. Thomas obtained his undergraduate degree in chemistry in 1982 and his medical degree in 1986 from West Virginia University. He then completed his medical training, residency, and Chief Residency at Wake Forest University, before coming to Johns Hopkins in 1990 as a fellow in infectious diseases. He went on to earn his Master of Public Health at the Johns Hopkins Bloomberg School of Public Health. He joined the faculty at the School of Medicine in 1993 and the School of Public Health in 1994. In 2006, he became the Director of the Division of Infectious Diseases.
Dr. Thomas’ contributions to infectious diseases have been recognized by membership in the American Society of Clinical Investigation (2001) and the American Association of Physicians (2011) and the citation award from the Infectious Diseases Society of America. Thomas Research Dashboard and Publications
Dr. Susan Tuddenham is an Assistant Professor of Medicine in the Division of Infectious Diseases, Johns Hopkins Bayview. She earned her M.D. from the David Geffen School of Medicine at UCLA, her M.P.H. from the Johns Hopkins Bloomberg School of Public Health, and completed an Internal Medicine Residency and Infectious Diseases Fellowship at the Johns Hopkins Hospital.
Her research interests are in Sexually Transmitted Infections (STI), HIV, and the human microbiome. She currently holds an NIH K23 award focused on the impact of hormonal contraception on dysbiosis and the vaginal microbiome, and smaller grants investigating the impact of HIV on the gut microbiome. She also maintains an outpatient HIV clinic, an outpatient ID and STI clinic, and attends on the inpatient services for general ID. Tuddenham Research Dashboard and Publications
Jonathan Zenilman, MD is a Professor of Medicine; Dermatology; and Obstetrics & Gynecology at the Johns Hopkins University School of Medicine. He also has joint appointments in Population, Family and Reproductive Health; International Health; and Epidemiology at the Johns Hopkins University Bloomberg School of Public Health.
Dr. Zenilman is known internationally for his work in infectious disease epidemiology. Prior to coming to Johns Hopkins in 1989, he was a medical epidemiologist at the U.S. Centers for Disease Control (CDC) where he conceived, developed and implemented the National Gonococcal Isolate Surveillance Program (GISP). GISP operated continuously since 1987, and has been responsible for identifying multiple types of resistant strains before they became large clinical problems. He also coordinated and wrote the 1989 STD Treatment Guidelines and has collaborated closely with the CDC and the Baltimore City Health Department STD clinical research, policy and care issues.
He became chief of the Division of Infectious Diseases at Johns Hopkins Bayview Medical Center in 2003. Under his leadership, the Bayview division has increased from five to nine faculty members, and developed major clinical and research programs in STIs, hospital epidemiology, antibiotic stewardship and skin and soft tissue infections. Dr. Zenilman has >330 publications and is an active teacher, mentoring more than 40 fellows and residents during his career. His current clinical research interests include sexually transmitted infections, chronic wounds and non-tuberculous (NTM) mycobacterial infections.
Zenilman Research Dashboard and Publications