The Widest-spread Infectious Disease?

I was wondering where and how I could do a health care service stint in a place without the kind of health care I'm used to.  The first MD to answer my queries was in the Sierra Madre/Copper Canyon area of northern Mexico and he said, upon hearing I was a respiratory therapist, "We've been thinking about doing a tuberculosis prevention and control program."

That got me back to the forgotten fact that tuberculosis--I'll call it TB--kills more people than about any other disease that can be passed from one person to another, and almost all of them are in not-so-developed places.  It's a disease of the very poor.  I'm poor--have been buying gas about four gallons at a time until the next check comes, can't afford to fill the tank.  But I do have a tank, and nice clothes, or decent ones, though many I bought at thrift stores.  I got a great cotton shirt today for $4.

Where TB flourishes, lots of people live on something like $4 a month.

I don't know why anyone would even want to read this, but it feels like I need to write it to take TB more seriously.