The implications of nomenclature

Area of Science:

• Allergy and Immunology
• Clinical Research Methodology
• Microbiome Research

Background:

• Consistent terminology is vital for accurate interpretation of clinical research findings.
• Ambiguous definitions can lead to divergent conclusions among researchers and clinicians.

Purpose of the Study:

• To introduce a new nomenclature system for allergy.
• To examine how this new nomenclature influences conclusions drawn from clinical studies.
• To illustrate with an example how definitions and nomenclature impact study outcomes.

Main Methods:

• A review of a recent study investigating the efficacy of Lactobacillus GG in preventing infantile eczema.
• Analysis of the study's outcomes in light of established definitions of atopy and allergy.
• The study involved two groups: mothers/infants receiving Lactobacillus GG or placebo, with infantile eczema incidence as the primary endpoint.

Main Results:

• The study concluded that probiotics prevented infantile eczema, regardless of whether it was IgE-mediated (atopy) or non-IgE-mediated.
• However, IgE sensitization rates were similar between the probiotic and placebo groups.
• This indicates that while "atopic disease" appeared prevented, the underlying atopy (IgE induction) was not.

Conclusions:

• Accurate nomenclature is paramount for interpreting allergy research results.
• Preventive interventions should be evaluated against specific disease mechanisms, not broad disease categories.
• The study's conclusion that Lactobacilli prevent "atopic disease" is complicated by the finding that they do not prevent IgE sensitization, a key mechanism.