Answer:
This is hard to answer and explain but easy to question. Dusts are everywhere they float in the corners of your house as well as the middle of the air. The dust just flies around basically being controlled by wind. If the wind blows to you and dust follows it moves to you. However if you walk into the dust you move in the dust. But most likely it is the dust that moves from person to person but not always that's why it's hard to answer.