How small are particles addressed by airborne precautions?

Airborne precautions are specifically designed to protect against pathogens that can remain suspended in the air for extended periods and can be inhaled. The particles associated with airborne transmission are typically very small, allowing them to travel through ventilation systems and persist in the environment.

Particles measuring 0.001 mm or less (or 1 micron) are of particular concern because they are small enough to evade typical filtration systems and can penetrate deep into the lungs when inhaled. These particles can carry infectious agents such as tuberculosis, varicella (chickenpox), or measles.

Understanding the measurement of these particles is crucial for implementing appropriate safety and infection control measures in healthcare settings. The specific size of 0.001 mm aligns with established guidelines regarding airborne transmission, reinforcing the need for effective precautions such as the use of N95 respirators or powered air-purifying respirators (PAPRs) to provide adequate protection against these tiny aerosolized particles.