Our Fellows


Fellows with a sense of humor

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

First-year fellows

Abdullah Aljorayid, MD

First-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

First-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

First-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

First-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

First-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.

Second-year fellows

Jason Burnham, MD

Second-Year Fellow

I am originally from Houston, Texas. I graduated from the University of Texas Medical Branch (UTMB) School of Medicine in Galveston. I completed a residency program at Washington University School of Medicine.

I chose the ID fellowship because I have wanted to study infections since the first time I read about smallpox in fourth grade. I chose Wash U for my fellowship training because I loved working here so much as a resident.

Batool T. Eldos

Second-Year Fellow

I’m from Jordan and graduated from Jordan University of Science and Technology (JUST) in Jordan in 2007 and completed Family Medicine residency in JUST in 2012. I’m married and have an 30 month old daughter named Mariam.

I have chosen ID fellowship because ID is not quite well established in Jordan and would like to apply the knowledge and skills that I will learn during my fellowship to contribute in advancing the medical care in Jordan. I have chosen WashU for it’s reputation as a prominent school, ranking high nationally and internationally with great research opportunities. I know I will get great exposure to many different infections that will help enhance my career.


Matifadza Hlatshwayo, MD, MPH

Second-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

Second-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

Second-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.

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