Oral Bacteria May Hold Key to Reducing Peanut Allergy Severity
Researchers have discovered a potential link between bacteria found in the mouth and the immune system’s response to peanut allergies. The findings suggest that certain oral bacteria could help lessen the intensity of allergic reactions, offering a novel approach to managing this increasingly common condition.
How Oral Bacteria Impact Peanut Allergies
A study published in the scientific journal Cell Host & Microbe, conducted by researchers from the Health Research Institute of the Hospital de La Princesa in Spain and McMaster University in Canada, identified that bacteria of the genus Rothia, naturally present in the oral cavity, have the ability to break down peanut proteins associated with severe allergic reactions.1
Specifically, Rothia bacteria digest highly allergenic peanut proteins, potentially preventing the development of anaphylaxis – a potentially life-threatening acute reaction that can occur within minutes of exposure. Laboratory experiments demonstrated that when peanut proteins were pre-digested by these bacteria, they triggered a lower immune response compared to whole, undegraded peanuts.
Animal and Human Studies Support Findings
The research extended to animal models, where mice colonized with Rothia bacteria exhibited reduced severity of allergic reactions after consuming peanuts. Allergic mice receiving peanut proteins previously digested by Rothia also showed less severe responses, reinforcing the hypothesis that the oral microbiota can influence allergy intensity.
Researchers also analyzed data from two cohorts of peanut-allergic patients at Mass General Hospital and Mount Sinai Hospital. The results indicated that individuals with a higher abundance of peanut-degrading bacteria, such as Rothia, in their saliva could tolerate larger amounts of the allergen before experiencing symptoms.1 This suggests a correlation between the oral microbiome composition and the severity of allergic reactions.
Potential Therapeutic Implications
Peanut allergies affect between 1% and 2% of the global population and carry a significant risk of anaphylaxis.1 The increasing prevalence of peanut allergies has spurred research into new prevention and treatment strategies.
This study opens the door to developing treatments based on modulating the oral microbiota, such as using specific probiotics to increase the presence of beneficial bacteria. Strengthening these bacterial populations could serve as a complementary therapeutic approach to reduce allergic reactions and improve tolerance to potentially dangerous foods.
International Collaboration and Future Research
The research was led by Dr. Rodrigo Jiménez, head of the Research Group of IIS Princesa Type 2 Immunity and Dr. Alberto Caminero, professor of the Department of Medicine at McMaster University, along with their respective teams.1 Their work is part of an ongoing effort to understand the complex interactions between the human microbiota and the immune system, and how these mechanisms can be harnessed for the prevention and treatment of allergic diseases.
References
1 New Book Extraordinary Latinas Vol V Celebrates the Stories of 19 Latina Trailblazers. Norwich Bulletin. March 4, 2026. https://www.norwichbulletin.com/press-release/story/40616/new-book-extraordinary-latinas-vol-v-celebrates-the-stories-of-19-latina-trailblazers/