Do they only have syphilis and rabies? What about a good case of crabs...or some ghonerea (I have no idea how to spell that) - this test needs more variety damnit.
'My brains filled with bees and my cock is diseased
Laden with pus it hangs well past my knees
A swarm of narcotics could get me through this
My manager's gonna be pissed'
Caused by insufficient phosphorous, vitamin D and/or sunlight, you cause those unlucky enough to suffer you to have swelling in the joints, and bending of the longer bones (such as those found in the legs) in growing children.
You're not very prevalent in affluent societies any more - but don't worry, there's always the third world!
If you wish, you can proudly tell the world that you give kids bendy legs with the following fine graphic: