Table 3.

Potential Environmental Contributors to AD

Microbes
	Bacteria	S. aureus
	Viruses	Herpes simplex virus, molluscum contagiosum virus, coxsackie virus, vaccinia virus
	Fungi	Malassezia spp.
Aeroallergens
	Indoor allergens	House dust mite, pet dander, fur, cockroach, mold
	Outdoor allergens	Tree pollens, grass pollens, weed pollens
Air Pollution
	Particulate matter	PM2.5, PM10
	Gaseous pollutants	Sulfur dioxide, nitrogen dioxide, carbon monoxide
Climate
	Humidity	Low or very high humidity
	UV index	Low UV index
	Temperature	Low or very high temperature, high indoor heating days
	Precipitation	High precipitation
Food
	Rare occurrence	Cow’s milk, hen’s egg
	Birch pollen-related	Apple, carrot, celery, hazelnut

Note: Bacterial and fungal genera and species are italicized.