There are four main types of disease affecting poultry: metabolic and nutritional diseases; infectious diseases; parasitic diseases; and behavioural diseases.

Metabolic and nutritional diseases

These are conditions caused by a disturbance of normal metabolic functions either through a genetic defect, inadequate or inappropriate nutrition or impaired nutrient utilisation. These include Fatty Liver Syndrome, Perosis (or slipped tendon), Rickets and Cage Layer Fatigue.

Infectious diseases

An infectious disease is any disease caused by invasion of a host by a pathogen which subsequently grows and multiplies in the body. Infectious diseases are often contagious, which means they can be spread directly or indirectly from one living thing to another. These include Avian Encephalomyelitis, Avian Influenza, Avian Tuberculosis, Chicken Anaemia Virus Infection (or CAV), Chlamydiosis, Egg Drop Syndrome (or EDS), Fowl Cholera (or Pasteurellosis), Fowl Pox, Infectious Bronchitis, Infectious Bursal Disease (or Gumboro), Infectious Coryza, Infectious Laryngotracheitis, Lymphoid Leukosis, Marek’s Disease, Mycoplasmosis, Necrotic Enteritis, Newcastle Disease and Salmonellosis.

Parasitic diseases

Parasitic diseases are infections or infestations with parasitic organisms. They are often contracted through contact with an intermediate vector, but may occur as the result of direct exposure. A parasite is an organism that lives in or on, and takes its nourishment from, another organism. A parasite cannot live independently. These include Coccidiosis, Cryptosporidiosis, Histomoniasis, Lice and Mites, Parasitic Worms (or Helminths), Toxoplasmosis and Trichomoniasis.

Behavioural diseases

Abnormal behavioural patterns can lead to injury or ill health of the abnormally behaving bird and/or its companions. These include Cannibalism (or aggressive pecking).

List of avian diseasesAscitesAvian encephalomyelitisAvian influenzaAvian Intestinal SpirochaetosisAvian tuberculosisCannibalism (or aggressive pecking)Chicken anaemia virus infection (or CAV)ChlamydophilosisCoccidiosisColibacillosisCryptosporidiosisCandidiasis (or crop mycosis)Egg drop syndrome (or EDS)Fatty liver syndromeFowl cholera (or pasteurellosis)Fowl poxHistomoniasisInclusion body hepatitis (or Fowl adenovirus type 8)Infectious bronchitisInfectious bursal disease (or Gumboro)Infectious coryzaInfectious laryngotracheitisLeg and skeletal problemsLice and mitesLymphoid leukosisLympoid Tumour Disease (Reticuloendotheliosis)Marek’s diseaseMycoplasmosisNecrotic enteritisNewcastle diseaseParasitic worms (or Helminths)Rickets and cage layer fatigueToxoplasmosisTrichomoniasisViral arthritis (tenosynovitis)