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Disease-Definition

Disease is defined as a departure from health, and includes any condition that impairs normal body functions. Disease results from a combination of indirect causes that reduce resistance or predispose an animal to catching a disease, as well as the direct causes that produce the disease. Direct causes can be divided into two main categories, infectious and non-infectious. Some of the non-infectious conditions may result in reduced immune response (e.g. problems with nutrition), or increased contact with infectious organisms (e.g. poor housing and management), and will lead to increased incidences of infectious diseases.
In contrast to modern poultry production, village-based poultry production is often characterised by a range of diseases occurring at the same time. Most often free-range poultry have sub-clinical infections with a high number of endoparasites and ectoparasites.

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