It my understanding that the difference between this and other airborne things is that the particles that get expelled from covid patients contains liquid droplets that are pretty heavy and so they fall out of the air quickly and onto surfaces, they dont float around and linger.

Smaller lighter particles can just float around in the air for hours and linger, then you just have to breath them in. With covid you'd have to touch a surface that droplets fell onto, and then touch your face or something.

Verify this info before counting on it for anything serious, I am a lay person with possible misunderstandings.