In a recent episode of MythBusters they discovered that the particulate from a sneeze can travel approximately 13 to 17 feet at speeds of just under 40 mph. The particulate spray from mucus is rather heavy, and would likely float to the ground within a minute or two. However, some biological matter (i.e. bacteria, viruses, etc.) may become airborne without being attached to mucus, and therefore might remain in the air a little longer. Thankfully, the air can be a hostile environment for bacteria and viruses unless they have something warm and wet to cling to, so if they are airborne for long periods of time, they might no longer be as dangerous.
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