The rows of sick and dying have gotten worse.
Carlisle walks unaffected. He wears a mask only because he believes humans should. He is as soothing to the sick as he is able, as calm in their last moments as he can. He has five hundred years of medical experience. Most of those are useless, especially now, in the face of a thing that is not even alive.
There is a darker purpose to his lonely vigil, passing night after night through the beds, working tirelessly because he does not tire. He is desperately, soul-burningly lonely, and he hopes that among the faces of the damned he will find someone to bring into his personal darkness, a companion to teach the ways of night and blood.