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Updated: May 8, 2026

Intralymphatic Immunotherapy and Vaccination in Mice
07:33

Intralymphatic Immunotherapy and Vaccination in Mice

Published on: February 2, 2014

Sublingual immunotherapy.

A J Frew1, H E Smith

  • 1Department of Medical Specialties, School of Medicine, University of Southampton, UK.

The Journal of Allergy and Clinical Immunology
|March 10, 2001
PubMed
Summary
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Sublingual immunotherapy (SLIT) shows promise as an alternative to injection immunotherapy (SIT), with consistent symptom improvement and safety in small human trials. However, further evaluation is needed before widespread clinical recommendation.

Area of Science:

  • Allergy and Immunology
  • Immunotherapy Research
  • Clinical Trials

Background:

  • Sublingual immunotherapy (SLIT) is being explored as a potential alternative to traditional subcutaneous injection immunotherapy (SIT).
  • Animal studies suggest topical allergen administration may modulate immune responses, potentially reducing IgE.
  • Existing human SLIT studies are generally small but indicate consistent symptom score improvements.

Purpose of the Study:

  • To evaluate the efficacy and safety of sublingual immunotherapy (SLIT) as an alternative to injection immunotherapy (SIT).
  • To assess the current evidence base for SLIT in managing allergic conditions.

Main Methods:

  • Review of published human clinical trials on sublingual immunotherapy (SLIT).
  • Analysis of reported symptom scores, objective measures of allergen reactivity, and systemic side effects.

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  • Comparison of SLIT with conventional subcutaneous injection immunotherapy (SIT) regarding efficacy, safety, and cost-benefit.

    • Main Results:

    • SLIT demonstrates consistent benefits in symptom scores across adult and pediatric populations with few systemic side effects.
    • Objective measures of allergen reactivity typically do not show significant changes in SLIT studies.
    • SLIT trials have involved a limited number of subjects compared to drug validation standards.
    • The cumulative allergen dose in SLIT can be substantially higher than in SIT, necessitating further cost-benefit analysis.

    Conclusions:

    • SLIT presents logistic advantages and appears safe for both adults and children.
    • While the evidence for SLIT is improving, it currently requires further rigorous evaluation before routine clinical adoption.
    • Standard SIT remains the established and better-supported immunotherapy option based on current evidence.