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Salivary IgA levels in normal children

R D'Amelio, R Bonomo, G P D'Offizi

    Diagnostic Immunology
    |January 1, 1986
    PubMed

    Insights

    Salivary IgA (SlgA) levels are often lower in children than adults, with defects present from birth. Full maturation of SlgA occurs after age six, potentially revising its role in immune protection.

    Area of Science:

    • Immunology
    • Pediatrics

    Background:

    • Salivary IgA (SlgA) is a crucial immunoglobulin in mucosal immunity.
    • Understanding SlgA development in children is vital for assessing immune competence.

    Purpose of the Study:

    • To determine normal salivary IgA levels in children aged 8 months to 6 years.
    • To identify the prevalence of SlgA defects in this pediatric population.
    • To compare pediatric SlgA levels with adult populations.

    Main Methods:

    • Quantitative analysis of salivary IgA (SlgA) levels.
    • Study cohort: 1,539 healthy children (8 months - 6 years).
    • Comparison with established adult SlgA reference ranges.

    Main Results:

    • Absence of SlgA found in 0.26% of children; relative defects (<1 mg/dl) in 1.62%.
    • Mean SlgA levels were significantly lower in all pediatric age groups compared to adults.
    • No significant differences observed between males and females, or correlation with allergic/infectious history.

    Conclusions:

    • Congenital SlgA defects (absolute or relative) are present from birth.
    • Complete maturation of salivary IgA (SlgA) is achieved after 6 years of age.
    • The protective role of SlgA against allergies and infections may require re-evaluation in early childhood.

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