Answer:

Chicken pox, sometimes called "sore head," becomes manifest in the form of scabby excrescences on the comb, lobes, face and the unfeathered portions of the head.

The sores are wart-like in appearance and may become so numerous and serious as to result in death.

The disease is contagious and afflicted birds should be immediately separated from the flock and treated.

The trouble generally makes its appearance in wet weather during the summer. Damp, filthy poultry houses increase the tendency toward the disease, and in any event is favorable to its development.

The prime cause of it is often mosquito or flea bites upon a fowl whose system is not able to throw off the poison.