Dust
mites are one of the most common allergens throughout the world.They grow best indoors in warm, humid
environments.Their growth is hindered
in very dry climates.Carpeting and
upholstered furniture are the major sources in the classroom, but mattress
and pillows are the major source in the home.
Cats and
dogs are the most common cause of pet allergies.In cats, the allergen is present in skin
secretions and saliva, and isnt part of the hair.The substance dries on the hair from skin
secretions or when the cat licks its hair.In the case of the dog, the allergen is contained in skin scales and
hair.Pet allergens are very tiny
particles and they float in the air for prolonged periods of time, and stick
to whatever they contact.In
classrooms without pets, the clothing of children who have pets at home can
be a major source of allergen, enough to cause symptoms in allergic children.
Pollens
are usually encountered outdoors.The
types of pollen varies by the time of year.Tree pollen is usually present in the early spring, grass pollen in
the late spring and early summer, and weed pollens in late summer and early
fall.Children participating in PE or
recess during high pollen days can have allergy problems.
