Dr Thomas Marrs
Consultant Paediatric Allergist
Skin Health & Allergy
Sub-specialties: Allergy, Clinical Immunology, Food Allergy, Paediatric Allergy, Immunotherapy, Provocation Food Challenges, Skin Prick Testing, Eczema, Atopic Dermatitis, Asthma, Hay fever, Allergic Conjunctivitis, Insect Sting, Eosinophilic Oesophagitis, Swallowing Disorders, Gastroesophageal Reflux Disease, Abdominal Pain, Constipation, Diarrhoea, Paediatrics.
02036532007
Overview
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.
About Dr Thomas Marrs
Dr Tom Marrs is a 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. He also leads the dedicated Paediatric Allergy Research Clinical Research Facility at Evelina London, and is Chief Principal Investigator for the recent Peanut Patch Immunotherapy commercial trial. His independent academic research includes NIHR-funded grants to co-design interventions to reduce the risk from food allergies for young children.
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 Hospital of Chelsea, and Great Ormond Street Hospital.
Dr Marrs was awarded his PhD in eczema, food allergy, the prevention of food allergies and the 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. His ongoing research is assessing different modalities for food immunotherapy, especially focused on young children.
Areas of Expertise
Dr Thomas Marrs performs a range of paediatric treatments including:
- Food Immunotherapy
- 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
Additional Information
Awards
- Finalist for Director of Allergy Academy, at BMJ Awards, 2018
- Best Registrar Presentation, British Association of Dermatologists, 2016
- Barry Kay Prize in Paediatric Allergy, British Society of Allergy and Clinical Immunology, 2014
- Distinction in Allergy MSc, Imperial College, 2011
Memberships
- British Society of Allergy and Clinical Immunology; Paediatric Secretary
- European Academy of Allergy and Clinical Immunology
- Director of Allergy Academy, King’s College London
- Royal College of Paediatrics and Child Health
- General Medical Council
Research Highlights
Dr Thomas Marrs runs several clinical trials, was one of two doctors leading the clinical activity within the largest food allergy prevention trial ever run in the UK and has independent research grants, including with the UK’s National Institute of Health Research (NIHR). He leads the UK’s largest Paediatric Clinical Research Facility for Paediatric Allergy at Evelina London and has achieved multiple publications in peer-reviewed journals, which are updated regularly under Pubmed (PubMed) by searching for Marrs Tom[author]’.
His main research interests include:
- Offering new modalities of immunotherapy and food allergy prevention to achieve complete remission of food allergy
- Developing equitable integration of food allergy treatments into healthcare services
- Identifying and reducing risk factors for food allergy in young children
- Developing new pathways for safest care of those with food allergy
Key Publications
- National Guidance on the Implementation of Palforzia® Peanut Oral Immunotherapy in the UK: a Delphi Consensus Study, 2024, Clinical Experimental Allergy
- Optimising the Management of Food Allergy by Targeting Immune Plasticity, 2024, Clinical Experimental Allergy
- Association of frequent moisturiser Use in Early Infancy with the Development of Food Allergy, 2021, Journal of Allergy and Clinical Immunology
- 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
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