Of course, these presumptions were made using a computer model, and the real world can introduce lots of unpredictable scenarios (a sick person sneezes while walking to the lavatory or brushes up against you while boarding, etc.), but it's still nice to know airplanes may not be the crazy disease-spreading machines we all thought they were. In fact, of the 229 surface and air samples the researchers collected, not a single one tested posted for even traces of 18 different common respiratory viruses.
And while all this intel is well and good, there's really no way to plan ahead to prevent yourself from being seated in close proximity to a flu-ey or sneezy specimen. All you can hope for is that you'll be able to finagle your way into a free seat away from an obviously sick person once you board (or try to swap with some unsuspecting poor soul).