(1->3)-beta-D-Glucan in your home: a safety profile

(Your Household-specific data is limited; this page draws from human adult context.) (1->3)-beta-D-Glucan (BDG) is a polysaccharide component of the cell wall of most fungi (except Mucorales and Cryptococcus, which have minimal BDG). It is a clinically validated biomarker for invasive fungal infection: the Fungitell assay (serum BDG >80 pg/mL) has sensitivity of 70-80% and specificity of 80% for invasive candidiasis and aspergillosis, and is included in EORTC/MSG diagnostic criteria. In indoor air, BDG is a biomarker for fungal biomass exposure: concentrations in water-damaged buildings range from 1-100 ng/m3, versus <1 ng/m3 in unaffected buildings. Immunologically, BDG is recognized by Dectin-1 receptor on macrophages and dendritic cells, activating NF-kB and triggering pro-inflammatory cytokine release (TNF-alpha, IL-1beta, IL-6). Chronic inhalation exposure in occupational settings (cotton mills, grain elevators, composting facilities) is associated with byssinosis-like symptoms, airway inflammation, and reduced lung function. NIOSH has proposed BDG as an indoor air quality health endpoint. No formal occupational exposure limits exist; research-based threshold: 10 ng/m3 indoor air.