I've eaten off street carts since a little girl and have had food poisoning a total of five times since 1994:
7-11
Olivers
Ebeneezers
and two five-star hotels.
Never from a hawker or dai pai dong, or any such source. I have, however, had some of the most delicious food from hawkers, though
Update - that sounded as though I was a little girl in 1994...far from it I've live in HK since the early 60s and 1994 was my first food poisoning experience. And yes, I absolutely should have known not to touch a tuna sandwich from 7-11, especially as it was purchased in the late evening!