Chicken is one of the common domesticated animal. They are reared for meat and eggs, and are kept as pets. The susceptibility of chickens to various parasites such as lice, fleas, ticks and intestinal worms is high. They are also affected by a number of diseases. These are bird flu, fowl cholera, red mite, blackhead disease, yeast infection, mushy chicken diseases, and various other infection based diseases. These diseases can be prevented by taking precautionary measures such as routine vaccines and use of appropriate antibiotics. Proper feeding techniques, farm hygiene and veterinary care play a crucial role in disease management. This book contains some path-breaking studies in the field of chicken health. It consists of contributions made by international experts. A number of latest researches have been included to keep the readers up-to-date with the global concepts in this area of study.