Air conditioning and air filtration seems to be good at limiting spread right? That would give us an edge over the 1918 suckers.
ignoring phil's bugaboo, ordinary air conditioning has been proposed as a good way to promote, not limit, spread. however, there have been suggestions that hepa filters will remove a lot of the airborne virus and people have proposed installing uv traps in systems to kill virus before recirculating, so if we wanted to make the effort, we could probably outfit at least larger buildings and probably public transit with systems that did limit spread.
That study stated the virus wasn't found on the vents so they concluded it was more the direct wind blowing from the a/c into the other tables, not being recycled into the system?
It's a valid story but it is just overapplied I don't know many restaurants where three 10 person round tables are shoved in a 21' wide space. Especially now. They didn't rule out that the spread was within the family after the restaurant "We determined that virus had been transmitted to >1 member of family B and >1 member of family C at the restaurant and that
further infections in families B and C resulted from within-family transmission."
My last curiousity with that study is the index patient went from asympomatic at the restaurant to hospitalized that same day?