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Pediatric Infectious Diseases Fellowship Program

Meet the Fellows

Pediatric Fellow Joshua Wolf

Current Fellows

  • Afreen Abraham, MBBS

    Afreen Abraham, MBBS


    I was born and brought up in a military family in India. We moved around India every few years and so I am a mixture of different Indian cultures. After completing my medical school there, I came to the US to do my Pediatrics Residency at Southern Illinois University. My interest for infectious diseases stems out of the variety it encounters, and what could be a better place to explore that more than at St. Jude. Outside work I enjoy driving, traveling, hiking, making crafts and listening to music. I am looking forward to exploring Memphis and the opportunities at St. Jude and Le Bonheur.

  • Ellie Bittle, MD

    Ellie Bittle, MD


    Grew up in Fort Worth, TX. Attended university there and then left the country for medical school in Grenada. I spent 2 years in Atlanta, GA for clinical rotations before matching into residency back in Texas. Pediatric Infectious Diseases and Global Health have been the long-term goals since deciding to pursue a career in medicine.

  • Lisa Hiskey, DO

    Lisa Hiskey, DO


    I was born and raised in Iowa, then travelled around the Midwest for college, medical school, and residency. I worked as a pediatrician for a few years before starting Peds ID fellowship. I have a passion for working with immunocompromised patients, and I am incredibly excited and honored to be training at St. Jude and Le Bonheur. In my free time I enjoy hiking, traveling, and spending time with my family and my dog.

  • Sandra Castejón Ramirez, MD

    Sandra Castejón Ramirez, MD


    I was born and raised in Madrid, Spain, and went to medical school at the University of Navarra where I started to fall in love with Infectious Diseases and Microbiology. After medical school, I did two years of Microbiology and afterwards I went to Zaragoza to train as a pediatrician. After this, I decided I wanted to continue my clinical and research training in Infectious Diseases and now I am here in Memphis. I have been doing volunteer work first as a student and after as a physician in Sierra Leone since 2012 and this is how I also became interested in Global Health and HIV. Outside the hospital, I enjoy travelling, reading poetry, cooking and playing the guitar and ukulele with my husband.

  • Hayley Scheerer, MD

    Hayley Scheerer, MD


    I was born and raised in Kansas City, MO. Completed undergraduate at Truman State University and returned to Kansas City for three years to study olfactory neuroscience at the Stower’s Institute for Medical Research. I attended medical school at the University of Missouri-Columbia School of Medicine and moved to Memphis to complete my pediatrics residency at University of Tennessee Health Science Center, with plans to eventually complete a fellowship in Pediatric Hematology/Oncology. However, during my residency, I fell in love with the complexity and challenges presented in infectious diseases in the immunocompromised host. Due to the diverse and numerous opportunities provided at St. Jude and Le Bonheur Children’s, I am very excited to continue my medical training in Memphis! My academic interests include infections in the immunocompromised host and antimicrobial stewardship. When I’m not at the hospital, I enjoy cooking, hanging out with my pet chinchilla, exploring Memphis’ numerous restaurants and breweries, and cheering on my beloved Kansas City Chiefs!

  • Kate Shapiro, MD

    Kate Shapiro, MD


    I was born and raised in New Jersey. I received my BA in Psychology from Yeshiva University. I attended medical school at the Renaissance School of Medicine at Stony Brook University and completed residency training in Pediatrics at Stony Brook Children's Hospital. After spending 12 years in New York, my family and I moved to Memphis, Tennessee where I am doing my fellowship training in pediatric infectious disease at St. Jude and Le Bonheur Children's Hospital. I also have a passion for clinical breastfeeding medicine because of its role in infection prevention and immune system development in the infant. Some of my other academic interests include evidence-based medicine, research design, and infections in children with sickle cell disease.