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narrow definition of health: that a state of health is always the absence of a definable illness; individualistic: that sources of ill health are always in the individual, and not the environment which health occurs; treatment versus prevention: that the focus of health is on diagnosis and treatment of illness, not prevention
Most are non-infectious, although there are some non-communicable infectious diseases, such as parasitic diseases in which the parasite's life cycle does not include direct host-to-host transmission. The four main NCDs that are the leading causes of death globally are cardiovascular disease , cancer , chronic respiratory diseases , and diabetes .
Diseases and disorders VACTERL-H Vertebral abnormalities, Anal atresia, Cardiac defects, Tracheoesophageal fistula, Esophageal atresia, Renal and radial abnormalities, Limb abnormalities with Hydrocephalus
In epidemiology, force of infection (denoted ) is the rate at which susceptible individuals acquire an infectious disease. [1] Because it takes account of susceptibility it can be used to compare the rate of transmission between different groups of the population for the same infectious disease, or even between different infectious diseases.
Sickness behavior is a motivational state that reorganizes the organism's priorities to cope with infectious pathogens. [8] [9] It has been suggested as relevant to understanding depression, [10] and some aspects of the suffering that occurs in cancer.
Recent advances in psychological, medical, and physiological research have led to a new way of thinking about health and illness. This conceptualization, which has been labeled the biopsychosocial model, views health and illness as the product of a combination of factors including biological characteristics (e.g., genetic predisposition), behavioral factors (e.g., lifestyle, stress, health ...
Infectious diseases are sometimes called contagious diseases when they are easily transmitted by contact with an ill person or their secretions (e.g., influenza). Thus, a contagious disease is a subset of infectious disease that is especially infective or easily transmitted. All contagious diseases are infectious, but not vice versa.
While retrospective cohort studies try to compare the risk of developing a disease to some already known exposure factors, a case-control study will try to determine the possible exposure factors after a known disease incidence. Both the relative risk and odds ratio are relevant in retrospective cohort studies, but only the odds ratio can be ...