How do populace near severe allergies who live within a bubble breathe?

I do not mean to offend anyone with this sound out, I am really curious because I ave no clue as to how they can survive!

A person with severe allergies to people or something so unpromising that they have to live in a bubble--how do they get their nouns? A tank of air, like you'd use for swimming? Do you hold to open it every few hours to refill it with nouns? Is there a filter? What? I do not understand. Please do enlighten me.
Answers:     i'm pretty sure there is an air purifier attached on the outside.
People with that severe allergies generally jump live in one of the very isolated communities that cater to life-threatening allergy sufferers; I recall reading nearly one in the middle of the desert somewhere (very little growing, cuts down on allergens; very dry, so little to no mold or mildew, either), with immensely minimal houses (chemicals in carpeting and paints, etc, can also trigger many sensitivities and allergies). No bubbles, but still a very strong isolation.
concept of "living surrounded by a bubble" was made famous because of the "Boy In the Bubble", a boy who had no functioning immune system, so would die if exposed to any infectious organisms, have no defense at all against them. These days, there are treatments to create some immune function in such patients, so the last-ditch "isolation treatment" is across the world not necessary.

In what I can find about the two "bubble boy" cases, most references be on the effects of such a life, and attempted treatments, not on their ventilation systems; but one noted an extremely fine air filtration system (catching anything larger than 3 microns) contained by the mobile suit sometimes used for one.
empire live in bubbles?


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