Medical Management Of Biological Casualties (MMBC) Online Practice Test

What is the optimal particle size for aerosol delivery of a bio-agent?

0.1-0.5 microns 1-5 microns 10-20 microns 50-100 microns

Correct Answer:

1-5 microns

Explanation:

Particles in the 1–5 micron range are optimal because they can reach the deep lungs without being exhaled immediately or getting stuck in the upper airways. Larger particles (10 microns or more) tend to deposit in the nose and throat due to inertial impaction, so they don’t efficiently reach the lower respiratory tract. Very small particles (below about 1 micron) are often exhaled or cleared by diffusion with little deposition in the alveolar region. The 1–5 micron range strikes the right balance, enabling effective deposition on the alveolar surfaces for inhaled bio-agents.

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