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A sequela (UK: / s ɪ ˈ k w iː l ə /, [1] US: / s ɪ ˈ k w ɛ l ə /; [2] [3] usually used in the plural, sequelae /-iː /) is a pathological condition resulting from a disease, injury, therapy, or other trauma. Derived from the Latin word meaning "sequel", it is used in the medical field to mean a complication or condition following a ...
Sequelae can appear early in the development of disease or weeks to months later and are a result of the initial injury or illness. For example, a scar resulting from a burn or dysphagia resulting from a stroke would be considered sequelae. [ 2 ]
While it is commonly assumed that people either recover or die from infections, long-term symptoms—or sequelae—are a possible outcome as well. [1] Examples include long COVID (post-acute sequelae of SARS-CoV-2 infection, PASC), Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), and post-Ebola virus syndrome. [1]
It is a complication (sequela) of osteomyelitis. The pathological process is as follows: infection in the bone leads to an increase in intramedullary pressure due to inflammatory exudates; the periosteum becomes stripped from the ostium, leading to vascular thrombosis; bone necrosis follows due to lack of blood supply; sequestra are formed
An example of the former is the anaerobic bacteria species, which colonizes the mammalian colon, and an example of the latter are the various species of staphylococcus that exist on human skin. Neither of these colonizations are considered infections. The difference between an infection and a colonization is often only a matter of circumstance.
For example, a common cold is a primary disease, where rhinitis is a possible secondary disease, or sequela. A doctor must determine what primary disease, a cold or bacterial infection, is causing a patient's secondary rhinitis when deciding whether or not to prescribe antibiotics.
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Diagnosis also depends on evidence of a prior group A streptococcal infection in the upper respiratory tract (as seen in streptococcal pharyngitis and scarlet fever). The carditis is the result of the immunologic response targeting the person's heart tissue, and it is the most serious sequela that develops from acute rheumatic fever.