HUMAN DNA Found in Hot Dogs!

According to a USA Today report, it's in a "very small percentage" of hot dogs.  I'm not sure what that means.  Human DNA could be on my cheeseburger because someone touched the bun to pop it on the burger, or sliced my tomato.  How much DNA are we talking about?  If ground-up Chinese political prisoners turn out to be an integral part of the doggie, of course that's pretty barftastic.  If it's like, five skin cells from the factory worker on the assembly line, I have lots of other stuff to worry about.