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Fungi - bacteria - allergens
Molds, mold spores and their metabolites
Possible causes and sources: Water damage, thermal bridging, building materials, ventilation, air conditioning, etc.

Yeasts and their metabolic products
Possible causes and sources: Wet areas, inadequate hygiene, waste, improperly stored food, etc.

Bacteria and their metabolites
Possible causes and sources: Water damage, defective sewerage, inadequate hygiene, improperly stored food, etc.

Dust mites and other allergens
Possible causes and sources: Mites and their metabolic products, pollen, grass, animal hair, household dust, inadequate hygiene, humidity, ventilation, etc.