Your chicken's manure may carry all kinds of nasties with it. The most notable being that dreaded E.coli the media likes to report on so much. Things to remember though:
1) Most backyard compost piles don't get hot enough to kill E.coli (and a host of other nasties) anyway.
2) Most veggies are not in direct contact with the soil.
3) Your chickens only have one exit. Every time you bring an egg into the house, you're carting in microscopic bits of feces and everything inside of it. How many of you with kids let them collect the eggs? How many of them then touch their faces, mouthes, surfaces in your house, etc? Are they dead yet?
All of the recalls and reports on food borne illness have people particularly on edge about their food these days. Give your immune systems some credit, the very fact that you're living with and your children are growing up with livestock and garden-fresh veggies predisposes you to having a stronger one than most people. Studies show farm kids are less likely to be ill and suffer from asthma than city kids. The quantity and variety of pathogens they're exposed to day-in and day-out is a
good thing.