Details surrounding this case are being kept confidential -- which is only legal and right.
Leprosy is a bacterial infection. It causes red skin sores, hand and foot paralysis, and blindness if left untreated. It's contageous, but not highly contageous. In other words, you have to be in really close contact with someone who is infected and it appears to be transmitted through nasal droplets. And apparently armadillos are good at infecting people with leprosy.
Social media hasn't been kind about this story. I've seen several people suggest that the infected individual must be a refugee or an illegal immigrant. But I've seen nothing to suggest that this is true.