Our Fellows

Our fellows hail from around the globe with interests in a variety of infectious disease topics. Read about some of their fellowship experiences below.

The Division of Infectious Diseases welcomes five new fellows for 2017.

First-year fellows

First-Year Fellow


  • Medical Degree: Florida International University Herbert Wertheim College of Medicine, Miami, FL
  • Residency: Wake Forest Baptist Medical Center, Winston-Salem, NC (2017)

I am originally from Indialantic, FL. Outside of work and training I enjoy backpacking, grilling and fishing. I chose an ID fellowship training at Washington University because I wanted a large referral center for the interesting cases along with a very active cancer/BMT center that makes for excellent training in transplant ID. The collaboration between the microbiology lab and the division of infectious disease offers a unique opportunity to learn about the advances in diagnostics and gives the infectious disease fellows a great insight into what goes into every culture.

During my fellowship training I would like to focus on microbiology, patient safety, and hospital epidemiology.

First-Year Fellow


  • Medical Degree: Grant Government Medical College, Mumbai, India (2013)
  • Residency: Rochester General Hospital, Rochester, NY (2017)

I am originally from Amritsar, Punjab, India and moved to Mumbai for my medical school. Outside work I love to cook, paint and travel. I am a big time foodie and like to try different cuisines and new restaurants.

I chose WashU ID fellowship program as I wanted to train at a large referral and research center where I could get strong clinical training along with various research opportunities.

During my fellowship I would like to focus on Anti-microbial Stewardship, epidemiology and transplant ID.

First-Year Fellow


  • Medical Degree: Universiti Sains Malaysia School of Medicine Sciences, Kubang Kerian, Kelantan, Malaysia (2013)
  • Residency: Crozer Chester Medical Center, Newton Square, PA (2017)


Dr. Alan E. Barman Award for Academic and Medical Excellence, Crozer Chester Medical Center 2016-2017

My interest in infectious diseases began in Malaysia, where I was born and raised.  During my medical school training at the Universiti Sains Malaysia, I was fascinated by the myriad of endemic tropical infectious diseases such as malaria, dengue fever, and TB. I find it challenging and enjoy the constant evolving nature of this field; emergence of new diseases, re-emergence of old diseases, and antimicrobial resistance. I chose ID fellowship at WashU because of its strong clinical training, abundant research opportunities, solid program leadership, and more importantly the opportunity to tailor my educational experience to my career goals.  My research interests are hospital epidemiology and infection control.

First-Year Fellow


  • BA Neuroscience Major, General Music Minor: Vanderbilt University, Nahsville TN (2009)
  • Medical Degree: Medical College of Wisconsin, Milwaukee, WI (2014)
  • Residency: Medical College of Wisconsin and Affiliated Hospitals, Milwaukee, WI (2017)


  • Magnum Cum Laude, Vanderbilt University Bachelor of Arts (2009)
  • Dean’s List Vanderbilt University (6 semesters)
  • Rotary Club Service Excellence Award, Milwaukee, WI (2004)

I was born and raised in Milwaukee, WI. I studied Music and Neuroscience at Vanderbilt University then returned to Milwaukee to complete my medical education and Internal Medicine residency at the Medical College of Wisconsin. My wife has her Masters in Education and taught 1st grade in Milwaukee but is currently staying home with our new 5-month old son.

I chose ID because I am fascinated by every aspect of Infectious Diseases from microbiology to consults to epidemiology. I feel that I can make a significant impact with the research opportunities available in ID. I chose WashU because of its seemingly endless physical and intellectual resources in an environment that is friendly yet constructive.

First-Year Fellow


  • BS, Chemistry, BA in Spanish Language: Pacific Union College, Angwin CA (2008)
  • Medical Degree: State University of New York, University at Buffalo, Buffalo, NY (2015)
  • Doctor of Philosphy, Microbiology and Immunology: State University of New York, University at Buffalo, Buffalo, NY (2015)
  • Residency: Barnes-Jewish Hospital at Washington University Medical School, St. Louis (2017)

I’m from Angwin California. In my free time I enjoy sampling all varieties of sugar, particularly ice-cream. Other hobbies I enjoy include running ultra-marathons, scuba-diving and spending time with my dog.  I chose to stay at WashU for my ID fellowship because of both the fantastic breadth of cases as well as the depth of research expertise here.

Second-year fellows

Abdullah Aljorayid, MD

Second-Year Fellow

MD – Qassim University College of Medicine, Saudi Arabia
Residency – Case Western Reserve, Cleveland, OH

I am from Saudi Arabia and while at Case Western Reserve University I worked on a multi-year study of flu vaccine responses in older population. I completed my residency at University Hospitals Case Medical Center in Cleveland. I am married to my wonderful wife who is working toward her master’s degree in computer science. We have an 18 month old daughter.

Juan Calix, MD, PhD

Second-Year Fellow

I was born in New Orleans, LA, where I lived the first ten years of my life. I then moved in 1992 to my family’s homeland El Salvador, where I resided until I graduated from high school. I returned to the U.S. to complete my undergrad at Loyola University New Orleans. I took a year off before medical school to work in Hurricane Katrina/Rita relief efforts in Baton Rouge. I then obtained my M.D. and Ph.D. in microbiology from the University of Alabama at Birmingham. I was fortunate to have a successful doctorate career, having been rewarded an F31 grant from the NIAID, the UAB Samuel B. Barker Award for Excellence in Graduate Studies and multiple travel awards to present my research at the national and international level. Most importantly, while at UAB I met my wife who also obtained her PhD in Microbiology. We got married during our doctorate years.

Carlos Mejia, MD

Second-Year Fellow

MD – Universidad de San Carlos Facultad de Ciencias Medicas, Guatemala
Residency – Hospital Universitario La Paz, Madrid, Spain

I’m originally from Guatemala city, where I studied medicine and graduated from San Carlos University. I did my Internal Medicine training at La Paz University Hospital in Madrid, Spain.

Jane O'Halloran, MB BCh BAO (Hons), MRCPIMD

Second-Year Fellow


  • Specialist Registrar Training Program: Royal College of Physicians Ireland (2015)
  • Member of the Royal College of Physicians of Ireland (MRCPI): Royal College of Physicians of Ireland (2008)
  • General Professional Training: Royal College of Physicians of Ireland (2009)
  • Bachelor of Medicine, Surgery and Obstetrics & Gynaecology, (MB BCh: National University of Ireland, Galway, Ireland (2006)

Krunal Raval, MD

Second-Year Fellow

MD – Pramukhswami Medical College, India
Residency – St. Luke’s Hospital, St. Louis, MO

I am originally from Ahmedabad in India. I received my medical school training from Pramukh Swami Medical College (PSMC) at Karamsad, India. I completed my internal medicine residency at St. Luke’s Hospital in Chesterfield, MO. During my residency, I was awarded “best intern of the year” and was elected as chief resident. I won a Poster as well as a Research Presentation competition during my residency.

I am married to my wonderful wife, Dhwani, and we have a one year old daughter, Ruhi. My families have always been strength and inspiration during all my endeavors.

Third-year fellows

Matifadza Hlatshwayo, MD, MPH

Third-Year Fellow

I am originally from Harare in Zimbabwe. During my time in Cleveland I was awarded the Richard J. Fasenmayer award for HIV research, and as a graduating senior resident, the Harold C. Klein MD Humane Practice Award.

I would like to pursue a career in HIV, having become drawn to the multifaceted care required for HIV positive patients, and the potential in translational research and public health endeavors. Selecting this fellowship program was a no-brainer for me. It provides strong training in all areas of infectious diseases, and I was particularly struck by how invested the department is in supporting fellows as they develop their careers.

Brett Jagger, MD, PhD

Third-Year Fellow

After completing medical school I matched into the Physician Scientist Training Program at Barnes-Jewish Hospital, where I trained in internal medicine. I am married to my wonderful wife, Rebecca, and we have two daughters, Elizabeth and Margaret.

Since my undergraduate days in microbiology class, I have been fascinated by the microbial world, and this interest has only grown with each stage of my training. Particularly in virology, my field of interest, there are significant advances in both basic science and clinical research on a regular basis. It would be hard to imagine a more exciting, challenging, and rewarding profession!

In comparison with other institutions of comparable academic stature, WashU is more collegial and supportive for those pursuing an academic career path. Just as important, the Division has a track record of training and supporting physician-scientists with strong mentorship and career development. These factors are the perfect complement for the strong clinical training environment and excellent case mix. And St. Louis is really a great town! It’s been a lot of fun getting to know the city and exploring the many great neighborhoods.

Darrell McBride, DO

Third-Year Fellow

I am originally from Baltimore, Maryland. My primary focus will center around epidemiological and/or clinically based studies regarding domestic HIV populations.

I chose Washington University because of its many resources and funding regarding research, its varied patient population/myriad of endemic disease processes, and the structure of its ID program.

Prior fellows with a sense of humor

Highlights From 2016 Graduate Fellows

“My class of fellows are the highlight of my training here, as we have become a family, guided by our wonderful program director and division leadership. Together, we negotiated a steep learning curve and made work enjoyable. I was fortunate to have great research mentors in Dr. Powderly and Dr. Lawrence, who have helped mold my career and research interests.”
Anupam Pande, MD, MPH, 2016

“I am lucky to be working with three mentors who have a passion for infectious diarrhea (Drs. Erik Dubberke, Carey-Ann Burnham and Margie Olsen). They are exemplary scientists and are generous with their time and knowledge. I also am thankful to my career development mentors (Drs. Vicky Fraser, Bill Powderly, Hilary Babcock, Dave Warren, and Clay Dunagan), who are constant sources of support and are always there to nudge me in the right direction.” – Jennie H. Kwon, DO, 2016

“I had a wonderful experience as a fellow in the Division of Infectious Diseases. I had an amazing group of co-fellows with whom I spend most of my time both at work and outside of work. I know I have made friends for life. I have received extraordinary mentorship from Dr. Dave Warren, who has taken interest not only in my research, but also has helped me foster and further my career and personal goals. I am following a non-traditional path to academic medicine and infectious diseases, and with Dr. Powderly’s continuous support, I have had wonderful opportunities, including spending two months at the World Health Organization in Geneva, Switzerland.” – Caline Mattar, MD, 2016

“Being an ID fellow has allowed me to develop greatly in the clinical aspect of ID, which was my main goal. During my training I developed an interest in infection prevention and would like to thank my research mentor, Dr. Warren, for his guidance and constant support. I would also like to thank Dr. Hsueh for introducing me to the exciting world of antibiotic stewardship (AS) and allowing me to work with the new great AS team. Finally, big thanks to my co-fellows, whom I’m sure I will remain friends with for a long time.” – Maria Reyes Angeles, MD, 2016

“My training has greatly exceeded what I hoped for. In retrospect, I am amazed at the diversity and the complexity of the cases I have been able to see both as inpatient and as outpatient. I am most grateful for my mentors (William Powderly, MD, Margie Olsen, PhD, MPH, and Richard Hotchkiss, MD) and my collaborators. I am also very grateful that I have been able to work towards a Masters of Science in Clinical Investigation. My research has involved participation in 4 multicenter trials, and over a dozen studies of our own devising focusing on Candida, Histoplasma and Cryptococcus. Due to this work, I have been able to travel all over the United States, Central and South America, as well as Australia.
– Andrej Spec, MD, 2016