[Ditter]

Allery is an *over active* immune system. The more of the offending substance you come in contact with the worse the reaction. The body reacts irrationaly to ordinary substances that other people are not affected by. Asthma is one of the reactions along with headache, runny nose, rashes etc. Has nothing to do with dirt.

[CSM]

Then why can some people grow out of allergies? At the same time others can grow into the same allergies? (Your answer does show how contracting an allergy later in life is possible, after the exposure limit is reached for the person predisposed to get the allergy.) It has been shown that pet owner's have children with lower instances of allergies to animals.

I am not a biologist or a doctor, I am just connecting the dots. I don't see you offering alternatives to my theories. Do you have any?