Does my chicken have parasites?

[jimbrooke]

For a while my Rhode Island Red Maude has had a floppy comb and is rather sluggish. She's still got a good appetite but there's obviously something wrong because she's got a lot of poop splatter around her backside. I haven't noticed any worms, etc in her droppings, but something has been bugging her for a while now. Any ideas?

Thanks very much