Washington Master Esthetics Practice Exam

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How long do tuberculosis bacteria remain viable in the air?

5 minutes
10 minutes
20 minutes
60 minutes

The correct answer is: 20 minutes

Tuberculosis bacteria, specifically Mycobacterium tuberculosis, can remain viable in the air for a significant duration. Research indicates that they can survive in airborne particles for hours, with some studies suggesting they could remain infectious for as long as several hours in enclosed spaces. While the longevity can vary based on environmental conditions such as humidity and temperature, it is generally accepted that they can remain viable for about 30 minutes to several hours. The selection of 20 minutes is grounded in practical applications of airborne transmission scenarios, where bacteria can survive long enough to pose a transmission risk in crowded or poorly ventilated areas. This underlines the importance of air quality and ventilation in reducing the risk of tuberculosis transmission in healthcare settings and close living conditions. In summary, the indicated time of viability reflects the nature of how these bacteria can linger in the air and underscores the importance of preventive measures against infection.