Episode 69: COVID vaccines
On May 23, 2021, our host Dr. Marianne Ritchie was joined by Dr. Paul Offit, Director of the Vaccine Education Center and Professor of Pediatrics in the Division of Infectious Diseases at CHOP, Maurice R. Hilleman Professor of Vaccinology at […]



Marianne T. Ritchie, MD was one of the first female gastroenterologists practicing in the Philadelphia area. An advocate for over 30 years, Dr. Ritchie developed the
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