Like jboo, I agree french fries are pretty safe since they are cooked and probably not handled by food service workers.

However, if you really want more info (and you are mentally prepared to know), I would encourage you to read CDC Vital Signs: Preventing Norovirus Outbreaks. There are a couple of statistics in there that highlight how gross food service in the US really is. One in particular is that 1 out of 5 food service workers reported going to work while sick with v* and d* (we probably all want to have these people tried and executed, but the fact is - they don't get paid time off and probably can't afford the loss of wage while sick). Many of them touch food with their bare hands even after its cooked (or your utensils or your plate or drink cup, etc etc) and another stat from that site is that the food service population has been observed to wash their hands only about 25% as much as they should.

Also - norovirus is contagious both before and after someone is sick with it (although if they don't have symptoms they are less contagious).

I hope I didn't scare you with those stats too much - no matter how gross food service is, the fact is that it's very unlikely you would catch anything from a particular visit. Only about 6% of the US population gets the norovirus per year, and the person who prepared your food would have to be in that 6% within the last 2 weeks.

Just saying though - food service is NASTY and that's why I eat out very very rarely and only when forced, even though I've won the emetophobe genetic lottery and am immune to most strains of norovirus. I'd just rather not eat poop with my food.