Although boa might be asymptomatic carrier of IBD it's quite rare and there's no proof the virus that's likely causing it is airborne. Besides, if that's the case, quarantine wont help as you'll realize the problem only once you introduce the new animal into the collection and pythons start dying.
I wouldn't worry too much, keep the new boa in the basement and make sure it doesn't carry any other much more common disease or parasite.
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