You heard it right an Oregon man was trying to save some poor mouse from a cat's mouth and the mouse bit him. Hell, he was probably pretty smart because the cat also bit him (double penetration). And go figure, the man gets the 200 year old bubonic plague! All we can say about this is that clearly this man is a noob when it comes to handling a wild mouse (which is the deadliest animal on earth).
Should you be scared? Well, considering the fact that 74% of Europe was destroyed by the plague, there is reason for you to believe that this could be an apocalyptic virus. So you should definitely be very afraid.