S.Hourigan Bio

Suchitra Hourigan, MD

Suchitra Hourigan, MD

Dr. Suchitra (Suchi) Hourigan was born in the United Kingdom and earned her medical degree from the University of Oxford. She is board-certified in both pediatrics and pediatric gastroenterology, having completed her residency and fellowship at Johns Hopkins Hospital. In 2021, she joined the National Institute of Allergy and Infectious Diseases (NIAID), NIH, as a Lasker Clinical Research Scholar, where she now leads the Clinical Microbiome Unit.

Her laboratory focuses on developing and testing pregnancy and early-life microbiome interventions aimed at preventing chronic inflammatory and immune-mediated diseases. While animal and observational studies have established that dysbiosis—imbalances in the gut microbiome—is linked to numerous chronic conditions, Dr. Hourigan’s research takes the field beyond descriptive work by implementing first-in-human clinical trials. Her integrative approach combines objective assessments of health outcomes with in-depth mechanistic studies, allowing her team to explore how microbiome shifts influence host physiology and immunity.

A central focus of her work is early life, a critical window for gut microbiome development and immune regulation. She is leading the first randomized, placebo-controlled trial of vaginal seeding in infants born by cesarean section, a group at heightened risk for obesity, atopy, and other inflammatory conditions. Through these pioneering efforts, Dr. Hourigan is advancing translational science that not only tests microbiome-based therapies but also illuminates the mechanisms driving host–microbiota interactions in human health.

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