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Marek’s Disease Virus (MDV) is one of the best-known poultry diseases. It causes tumors and immunosuppression in mainly chickens, but is occasionally seen turkeys and quail.

Omphalitis is a fairly common infection, also known as mushy chick disease or yolk sac infection, and it occurs in the first few days of a bird’s life. It is seen most commonly in artificially hatched eggs and is associated with contaminated eggs or incubators.

Most of the multiple diseases that affect a chicken’s nervous system have the same clinical signs. Common signs are full or partial paralysis of one or multiple body parts, loss of balance, walking in circles, blindness, wry neck, and even convulsions.

Medically, salpingitis is the inflammation of the oviduct in hens. The oviduct is a tube connecting a hen’s ovary to her cloaca; it’s the passage that an egg follows before being laid.