(medium) without which it can't spread. That's why people wear mask. And u can't spread COVID19 on the surface of the moon. (However I must stress that though COVID19 spreading is facilitated by Satan, the COVID19 virus was created by neither Yahweh nor Satan; it came from another source; I might expound on it later)

Ephesians 2:2: "wherein in times past ye walked according to the course of this world, according to the Prince of The Power of The Air.."