@Iluviaporos - Actually, I think this applies to street vendors all over the world, even hot dog street vendors in New York (perhaps especially them!). No matter how rigidly they have been checked by food authorities, I'm sure there are some days when the guy just doesn't wash his hands after handling money, for example.
Whenever you've got one person doing every job in selling food, you're going to end up with risky behavior.
But there are some amazing street vendors out there. And not just food, there are some great craftspeople and artists who have realized they can make a living in a little cart on a busy street. It adds color and life to a city and I wouldn't have it any other way.