I got my info from Merck Manual of Diagnosis and Therapy. I'm skeptical of this peafowl website. Seems kinda random. Merck is essentially the Vet bible. Also I now speak from experience. I took back the sick chickens i had and just bought some newly hatched chicks. I sanitized my coop well then painted it and moved it to the opposite side of the yard. Chicks went out at 4 weeks and have been perfectly healthy. Going on 3 weeks outside now.