Dust mites require 3 environmental conditions to survive and thrive:.
Dust mites don't drink so they survive on the humidity where they live.
They require warmth to be able to thrive.
They eat shed skin that is found in our beds or in the carpeting in our homes. In order for the dust mites to be able to digest the shed skin it must be broken down by a bacteria so the dust mite can digest the skin.
The other main point about dust mites is that it is not the dust mite itself that people react to but their feaces which accumulate at an astonishing rate.