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Sep 17, 2024 · disease, any harmful deviation from the normal structural or functional state of an organism, generally associated with certain signs and symptoms and differing in nature from physical injury. A diseased organism commonly exhibits signs or symptoms indicative of its abnormal state.
Diseases are abnormal conditions that affect an organism’s body, organs, tissues or cells. Some are caused by pathogens, and organisms have defences to them. Part of...
In the development of a disease (pathogenesis) more is involved than merely exposure to a causative agent. A room full of people may be exposed to a sufferer from a common cold, but only one or two may later develop a cold. Many host factors determine whether the agent will induce disease or not.
Revise the types and causes of diseases in animals and plants. Find out how the immune system defends the body against disease.
Diseases may be classified by cause, pathogenesis (mechanism by which the disease is caused), or by symptoms. Alternatively, diseases may be classified according to the organ system involved, though this is often complicated since many diseases affect more than one organ.
Feb 18, 2022 · Infectious diseases are disorders caused by organisms — such as bacteria, viruses, fungi or parasites. Many organisms live in and on our bodies. They're normally harmless or even helpful.
Sep 13, 2024 · Infectious disease is a process caused by an agent, often a microorganism, that impairs a person’s health. Infectious diseases typically are caused by bacteria, viruses, fungi, or parasites.
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