Good news..

Yes, from the initial impact, the asthma meds have a really quick effect..I guess that corresponds with how quick an attack can develop, I suppose .
Missus gets hayfever, and similar results.
EDIT.found link.
https://abcnews.go.com/Health/criti...ooms-coronavirus-cases-soar/story?id=69759965
And to others in general.
Not sure if we'll known.
But if breathing is poor
As a last resort, probably while calling or waiting for ambulance, 8-10 sprays of an asthmatics blue inhaler, not the brown
Can open airways and allow more air in.
I will look for the link, but it is what doctors were recommending and doing on admissions to A&E, think I posted a way back on here.
As asthmatic since 11,. I only found that out last year had my most serious attack,, sprayed waited a bit felt no better repeated .eventually got to docs, gasping for breathe,
Doc told me, ten repeated sprays one after the other. That got me to a state where I could breathe and talk .scary day
So blue spray if desperate, for ALL... as a last resort, while calling or waiting for ambulance
10 quick sprays one after the other.