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I am allergic to dust mites.
Tiny little creatures you can not see. And they are not seasonal! And you can not avoid them, like domestic animals: people don't see them...

Cats? No. Dogs? No.
As a child I couldn't have a cat at home, while they supposed my father was allergic to it (their was no allergy tests available for him at that time, so they could not say for sure).
I wonder if in fact it was not the same dust mites.