What is the primary purpose of negative-pressure isolation rooms in biocontainment during a biological incident?

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Contain airborne contaminants by using a pressure difference that pulls air into the room and exhausts it safely. In a negative‑pressure isolation room, the air pressure inside is lower than in surrounding areas, so air flows into the room rather than out. That inward flow helps prevent any pathogen-laden air from escaping to other parts of the facility. The air that leaves the room is then exhausted outside or filtered with high-efficiency filtration, reducing the risk of spreading infection.

This approach specifically targets airborne transmission. Recycling air inside the room would risk re‑circulating pathogens, which is not protective. Sealing the room to prevent droplet transmission isn’t the purpose of negative pressure, since droplets are managed via barriers and standard precautions rather than by complete sealing. Noise reduction is unrelated to biocontainment.