My chicken just got diagnosed with this. I got her as a pullet and she's had a dirty bottom for the entire time I've had her (about 3 months now). First I treated her for lice, then worms, then a yeast infection to no avail. I finally bit the bullet and took her for a fecal occult test. The vet says he has never seen this before, but was able to diagnose what it was. He said the treatment is Fenbendazole for 5 days and then repeated again in 14 days. I'm just wondering if anyone else has had to deal with this?