Editor’s comment: Sublingual immunotherapy (SLIT) induces allergen-specific Treg cells in submandibular lymph nodes, but how these cells are maintained over the long term is unknown.

Winias et al. (Miyagi, Japan) showed that the long-term maintenance of SLIT-induced regulatory T cells critically depends on the gut microbiota. Using a mouse SLIT model, the authors demonstrated that depleting the gut microbiota after SLIT abolishes tolerance and disrupts Treg maintenance. These findings highlight the gut microbiota as an essential driver of durable SLIT-induced immune tolerance.

Editor’s comment: Allergen sensitization patterns are complex, and it is often hard to know which allergens truly matter for each patient.

Using IgE test data from over 45,000 people, Kim et al. (Seoul, South Korea) identified four main allergen patterns: mite, grass/weed, pet, and tree. Each pattern showed a different link to disease—mites to hay fever, pets to asthma, and trees to eczema—and was also related to higher eosinophils and total IgE.

This data-driven approach helps clarify which allergens drive each person's allergic reactions.