Areas of Expertise

Dr Thomas Marrs performs a range of peadiatric treatments including:

• Blood and component allergy testing
• Next-generation array blood testing
• Skin prick testing
• Provocation food challenges
• Allergy prevention
• Immunotherapy to environmental allergens (e.g. house dust mite, pollens, pet dander)

Some of the paediatric conditions he commonly treats are:

• Food allergies (cow’s milk, egg, soy, wheat, fish and seafood, sesame and seeds, nuts and tree nuts)
• IgE-mediated food allergy
• Non-IgE food allergy
• Eczema
• Atopic dermatitis
• Allergic and chronic asthma
• Allergic rhinitis (hay-fever)
• Allergic conjunctivitis
• Insect sting
• Latex allergy
• Cow’s milk proctocolitis
• Eosinophilic oesophagitis
• Difficulty swallowing
• Gastro-oesophageal reflux
• Abdominal pain
• Constipation
• Diarrhoea
• Faltering growth
• Difficulty gaining weight

About Dr Thomas Marrs

Dr Tom Marrs is Consultant Paediatric Allergist specialising in Allergy and Clinical Immunology, with nearly two decades of experience in the treatment of children’s allergies. Dr Marrs leads the Allergy Prevention Service at Guy’s and St. Thomas’ Hospital and the Joint Allergy-Gastroenterology Service at Evelina London.

Dr Marrs graduated from Clare College, Cambridge University, in Medicine, and trained at prestigious institutions including St Barts and the Royal London Hospitals, the Astrid Lindgren’s Children’s Hospital of Karolinska, Stockholm, the Royal Brompton of Chelsea, s Hospital and Great Ormond Street

Dr Marrs was awarded his PhD in eczema, food allergy, the prevention of food allergies and role of the microbiome, and has been appointed Director of the Allergy Academy, King’s College London, where he is also a Senior Honorary Lecturer.

Research Highlights

Dr Thomas Marrs has achieved multiple publications in peer-reviewed journals.

Key Publications

• Marrs tom[author] – Search Results – PubMed (nih.gov) shows full listing of publications
• Randomised Trial of Introduction of Allergenic Foods in Breast-fed Infants; New England Journal of Medicine, 2016; Randomized Trial of Introduction of Allergenic Foods in Breast-Fed Infants | NEJM
• Does atopic eczema cause food allergy? A systematic review; Journal of Allergy and Clinical Immunology; 2016 Does atopic dermatitis cause food allergy? A systematic review – Journal of Allergy and Clinical Immunology (jacionline.org)
• Gut microbiota development during infancy: Impact of introducing allergenic foods, Journal of Allergy and Clinical Immunology, 2021; Gut microbiota development during infancy: Impact of introducing allergenic foods – Journal of Allergy and Clinical Immunology (jacionline.org)
• Oral Food Challenges; the design must reflect the clinical question; Current Asthma Allergy Reports, 2015 Oral Food Challenges: The Design must Reflect the Clinical Question | SpringerLink
• Is there an association between microbial exposure and food allergy? A systematic review; Pediatric Allergy and Immunology, 2013 Is there an association between microbial exposure and food allergy? A systematic review – Marrs – 2013 – Pediatric Allergy and Immunology – Wiley Online Library