The stage during which the patient functions normally, although the disease processes are well established, is referred to as subclinical stage.
This stage is generally the incubation period for infectious diseases and for chronic diseases, it is the latency period. For clinical stage, the diseases are not detected through clinical detection and are below the surface while for a clinical disease signs and symptoms are clearly distinct in the patient.
There are generally five stages involved in the history of a disease which are underlying, susceptible, subclinical, clinical, and recovery.
One such example of clinical disease in which the disease processes are well established is diabetes mellitus.
There are three levels of disease prevention: primary prevention in which before health effect occurs, intervention is done; secondary prevention for which screening is done to identify disease as early as possible and tertiary prevention which is managing to stop or slow it.
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