ID Fellows


Portrait of 2nd year fellow Greg Canfield

Greg Canfield MD

My research focuses on application of lytic bacteriophage therapy in Enterococcus faecium in Dr. Breck Duerkop’s lab (Department of Immunology and Microbiology).  E. faecium is a major cause of nosocomial infection in immunocompromised patients. The rising tide of antimicrobial resistance in E. faecium, combined with a dry antibiotic pipeline provide an opportunity to consider novel approaches to therapy.  Phage therapy represents an intriguing treatment strategy.  Proof of concept of this approach was recently shown with the successful last resort treatment of several critical ill patients infected with multidrug-resistant strains of Acinetobacter baumanii, Pseudomonas aeruginosa, or Mycobacterium abscessus.  Whether this same approach might be effective in E. faecium infections remains unclear.  We hypothesize that characterization of phage-bacterial interactions will inform the rationale design of a phage cocktail against multidrug resistant strains of E. faecium. To address this hypothesis, we have identified several novel bacterial proteins that may serve as receptors mediating phage infection in E. faecium.  Experiments to identify the function of these putative phage receptors is underway using various phenotypic assays. Future work will explore the efficacy of these phage against multidrug resistant strains of E. faecium in a mouse wound model of infection.  These initial basic mechanistic and animal studies will provide a foundation for clinical translation of phage therapy in patients infected or colonized with E. faecium. I enjoy hanging out with my wife and corgi, hiking, drinking beer, brewing, watching football and hockey, traveling.


Portrait of 2nd year ID fellow Angela Budgin

Jonathan Schultz MD, MPH

I was born and raised in the great state of Iowa, where I completed my undergraduate degree in Chemical Engineering at Iowa State University, however not wanting to work in a chemical factory, I did the opposite and joined the Peace Corps, serving in Burkina Faso. There I lived in a mud hut in a remote rural village teaching math and science at a middle school in French on the edge of the Sahara desert. This experience sparked my interest in infectious diseases, public health and healthcare system strengthening in low resource settings. After completing my Peace Corps service, I studied Global Epidemiology at Emory University. After which, I worked for the Centers for Disease Control and Prevention (CDC) STOP Polio Program in Senegal. I then completed my MD at the University of Iowa and then a combined Internal Medicine and Pediatrics (Med-Peds) residency here at the University of Colorado. My research interests are in malaria and its interactions with other infections. My primary mentor is Dr. Rosemary Rochford. I am also passionate about Neglected Tropical Diseases (NTDs) in low resource settings. My long-term career goals are to work in academic global health research vs. global health work with the CDC.


Portrait of 2nd year ID fellow Tanit Phupitakphol

Tanit Phupitakphol, MD

I was born and raised in Bangkok, Thailand. I graduated from the Faculty of Medicine, Siriraj Hospital, Mahidol University. Prior to a residency training, I was involved in the HIV clinical research at HIV-NAT Thai Red Cross-AIDS Research Center, which is one of the ACTG sites in Bangkok. Then, I did the residency training at Metrowest Medical Center in Framingham, MA. My interest is in HIV clinical research and orthopedic infections. During the free time, I enjoy traveling, hiking, exercise and civil aviation.

Portrait of 2nd year ID fellow Samuel Windham

Sam Windham MD, MS

I am currently a second year fellow researching innate immunity in sepsis. I will be doing a one year fellowship in Critical Care Medicine at Washington University next year with the plan of eventually becoming a physician scientist studying the immunology of sepsis and septic shock. I attended the University of Missouri for medical school and completed residency at the Medical College of Wisconsin. I was immediately drawn to our program at the University of Colorado thanks to highly involved faculty that have helped me figure out my career, as well as the expansive research and mentorship available on campus. It also helps that Denver has one of the highest breweries per capita in the country.

Swati Mathur


Portrait of 2nd year fellow Greg Canfield

David Fraulino, DO

I was born and raised in Portland, Connecticut and completed my undergraduate degree at Salve Regina University in oceanside Newport, Rhode Island where I first engaged in basic science research characterizing virulence factors within species of Leishmania.  After college, I went north to Boston, Massachusetts to pursue a research position at Boston Children’s Hospital/Harvard Medical School within the immunology lab of Dr. Raif Geha. Here we focused on identifying novel causes of primary immune deficiencies by creating knock-in mouse models. I then continued my tour up I-95 to the Portland, Maine area where I received my medical degree from the University of New England. Coming full circle, I returned home to complete my residency training in Internal Medicine at the University of Connecticut.  My clinical interests are in antibiotic stewardship and HIV medicine. In my spare time I enjoy hiking, rock climbing, and skiing (typical Denver transplant...).

Portrait of 2nd year fellow Greg Canfield

Lilian Vargas Barahona, MD

I am originally from Honduras where I went to medical school. During my medical training I was involved in the care of patients in impoverished and neglected communities and saw firsthand the burden that many infectious diseases posed for these populations. I moved to the United States to do an internal medicine residency at Houston Methodist Hospital where I had exposure to ID in diverse populations, including transplant patients, further increasing my interest in the field. My interests include neglected tropical diseases, care of underserved populations, endemic mycoses, and HIV. In my free time I like to read, cook, drink coffee, listen to music, and spend time with my family.

Portrait of 2nd year fellow Greg Canfield

Zachary Shepard, MD

I was born in Texas, but grew up in Maryland. I returned to Texas to attend the University of Texas at Austin before working as an English teacher in Houston for several years. I received my MD from Baylor College of Medicine in 2017 and moved to Ann Arbor, Michigan to complete internal medicine residency at the University of Michigan.  Within infectious diseases I am interested in hospital epidemiology and antimicrobial stewardship. When I'm not in the hospital or clinic, I enjoy spending time with my spouse, Heather, and our dog, Duke, as well as running and hiking, and playing board games.  

Portrait of 2nd year fellow Greg Canfield

Jose Henao Cordero, MD

I was born in Colombia and grew up in Costa Rica where I went to medical school. After doing ID rotations in the US as a med student I decided that was the career path for me so I completed my IM residency at Hennepin County Medical Center in Minneapolis, Minnesota. What I like about ID is the diversity of the field including not only in the pathologies and organisms, but also the patient population you see. I have a special interest in Transplant ID and I am planning on doing a third year on Transplant. What brought me to the University of Colorado was the opportunity to explore my particular interests with the variety of transplants we do, the multicultural patient population, and the familiarity and inclusion I felt from the program. Outside of work I enjoy hiking, reading, eating Latin food, exploring Denver and dancing salsa.