A disease is any condition which results in the disorder of a structure or function in a living organism that is not due to any external injury. The study of disease is called pathology, which includes the study of cause. Disease is often construed as a medical condition associated with specific symptoms and signs. It may be caused by external factors such as pathogens or by internal dysfunctions, particularly of the immune system, such as an immunodeficiency, or by a hypersensitivity, including allergies and autoimmunity.
The majority of European (and global) biodiversity is made up of insects, but little is known about their distribution, abundance and the threats they face. This lack of knowledge is of particular concern for species involved in pollination, such as bees, butterflies and hoverflies and for the benefits society gains from pollination services.
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