Yeah, that’s bad, and I imagine if bubonic plague broke out in that one area it could be devastating. It’s not the norm across any large portion of society so we won’t see a larger outbreak of it.
That’s not to say those people don’t matter. It’s a systemic failure of the highest order that people aren’t housed and don’t have access to healthcare, it’s just they don’t create the conditions for a pandemic of that kind. We understand the disease vector now and we have largely eliminated it.