[metmom]

So where did the cat get it and how do they know that wherever it got the infected fleas that there aren’t more?

[verum ago]

So where did the cat get it and how do they know that wherever it got the infected fleas that there aren’t more

Plague is endemic in the Oregon / Idaho / Nevada high desert (fleas on wild rodents). There will always be more, unfortunately. That’s why they’re not fussing over the source- there’s no getting rid of it.