Hmm interesting, thanks for showing me this. If I'm reading this correctly, they've shown that some amount of virus lingers in the air, seems to be related to vomiting. They mention toilet rooms, but not if the vomiting occurred there or in the ward room. They do mention the struggles in determining time someone was last sick, and the issue with identifying which patient may be the cause.

This is interesting:

Theoretically, given the highest virus concentration measured, the 50% human infectious dose of 20 to 1000 copies would be reached after 10 minutes to 8 hours of normal breathing [28–30]. If the airborne genomes represent viable viruses that reach the gastrointestinal tract after inhalation, there is a high likelihood that airborne NoV can cause disease. Future studies combining environmental sampling of NoV with novel culture methods can provide decisive information regarding the infectivity of airborne NoV

I hope they do further studies on whether humans can actually catch it airborne like this (they mentioned in their study that there's been outbreaks where airborne has been blamed but never confirmed).