Mold-specific immunoglobulin G antibodies in a child population

Area of Science:

• Environmental microbiology
• Immunology
• Pediatric health

Background:

• Immunoglobulin G (IgG) antibody levels indicate significant mold exposure.
• No prior data existed on mold-specific IgG responses in healthy children in typical housing.
• Understanding these responses is crucial for assessing environmental exposures in children.

Purpose of the Study:

• To determine microbe-specific IgG antibody concentrations in healthy children aged 1-14 years.
• To establish age-related reference values for mold and actinobacteria exposure.
• To compare antibody responses between children raised on farms and those in other environments.

Main Methods:

• Enzyme-linked immunosorbent assay (ELISA) was used to quantify IgG antibodies to 21 molds and 3 actinobacteria.
• Antibody concentrations were measured in 103 children aged 1-6 and 111 children aged 7-14.
• International standard sera allowed IgG concentrations to be expressed in mg/l.

Main Results:

• IgG concentrations generally increased with age until 6-7 years, with a slower increase thereafter.
• Actinobacteria showed high concentrations in children under 3 years old.
• Children raised on farms exhibited significantly earlier increases in mold-specific IgG concentrations compared to other children for most microbes tested.

Conclusions:

• Reference values for mold-specific IgG antibodies are age-dependent.
• Separate reference values are recommended for farm children before school age due to distinct exposure patterns.
• This study provides essential baseline data for evaluating mold exposure in pediatric populations.