reptile mites, I believe (correct me if I am wrong), are not indiginous to the US, and come over when wild caught animals are imported.
They are able to breed and spread throughout collections as well, so if one reptile in a pet store or collection has mites, they may spread.
Mite eggs can lay dormant for some time, and can cling to substrate, clothing, etc.
This is one reason why quarantining new pets for a couple months is a good idea, if any of them have mites, you can catch it and not have to worry about them getting outside of your quarantine room.
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