TB is pretty rare in the US so I would expect that “patient zero” is an immigrant from someplace ...these days from Mexico, Central America or possibly Africa places where TB is not uncommon. My wife was a school nurse and she had a similar case with a Bosnian refugee who had a positive TB test. Fortunately the refugee was not TB positive and had been vaccinated with a BCG vaccine in Europe to prevent TB. This vaccine gives a positive TB skin test. A neighboring school was not so lucky and had an active TB case. Students and teachers there with close contact had to take anti-TB medications for most of a year and the whole school had to be skin tested.
Missing in this article is information about the medication the students have to take for a year. It can cause liver damage.
How would you like your son and daughter being exposed to an illegal, having to take these meds for a year, and then needing a liver transplant a few years down the road.