I was probably in fifth grade when I learned about tuberculous. I remember the teacher telling us about how people got sick and died because of poor health habits. Epidemics spread because people didn't wash their hands, or cover their mouths when they coughed, and they spit on the sidewalk! The teacher told us that there were laws against spitting on the sidewalk to help stop the spread of disease. And all of us in that class learned this lesson.
Maybe I was less observant in my youth, but I don't remember people spitting. I wish I could say the same now. Last week I was at Safeway. As I walked toward the door a man exited and hocked a loogie on the ground right in front of the door. The slime glistened in the sunlight.
I may have tuberculous!