San Jose: Three TSA agents test positive for Covid-19
I hate to stoke FUD, but that's pretty much it for any semblance of containment.  If those TSA agents tested positive, 1) you can be sure other TSA agents at other airports are also infected, and 2) I'd be extremely surprised if they didn't pass Covid-19 to a significant number of travelers, 3) whatever individual(s) gave it to the agents undoubtedly also gave it to other travelers.