Many years ago I worked in hospitals, during the height of AIDS, and we used to joke, if we had called in sick, and someone asked when we were back, "Oh, I had AIDS again." I tried telling that outside a hospital setting and people were horrified. It ain't like you can get cured, so getting it again was a hilarious concept.
Now I feed the homeless, and we make lots of Mr. Rogers "Beautiful Day in the Neighborhood" jokes when we get multiple ODs, bodies on the sidewalk, stabbings in the park...when you spend all your time in the middle of it, it does become kind of mundane.