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Airborne Precautions

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Airborne Precautions,
guidelines recommended by the Centers for Disease Control and Prevention for reducing the risk of airborne transmission of infectious agents. Airborne droplet nuclei consist of small-particle residue (5 μm or smaller in size) of evaporated droplets that may remain suspended in the air for a long time. Airborne transmission occurs by dissemination of either airborne droplet nuclei or dust particles containing the infectious agent. Microorganisms carried in this manner can be widely dispersed by air currents and may be inhaled or deposited on a susceptible host from the source patient. Special air handling and ventilation are required to prevent airborne transmission. Airborne precautions apply to patients known or suspected to be infected with epidemiologically important pathogens that can be transmitted by the airborne route. Examples include measles (rubeola), varicella zoster virus infections, Legionella infection, disseminated zoster, and tuberculosis. Compare Contact Precautions, Droplet Precautions. See also Standard Precautions, Transmission-Based Precautions.


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Airborne precautions should be taken for all suspected cases of measles.
Airborne precautions require patients to be put in isolated areas "with negative pressure, a minimum of six air changes per hour, and appropriate filtration of air before discharged" (Werner 2002).
Hospitalized smear-positive patients could be released from airborne precautions (for which room charges typically are higher than for regular rooms), based on a negative NAA result (provided that the sample contains no inhibitory substances), rather than waiting for 3 consecutive negative AFB smears, as is the current CDC recommendation.
 
 
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airborne radar
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