What is delayed hypersensitivity?
delayed hypersensitivity is difficult to understand without the work definition of hypersensitive. In the medical sense, unlike emotional significance, hypersensitivity is a strong physical reaction to some form of antigen. Antigen is a substance presented to the body or body perceived as foreign. The body responds to an antigen in a perceptible way, such as the development of rash, asthma, developing allergic symptoms or showing symptoms of disease infection, but sometimes this reaction does not occur immediately and is delayed hypersensitivity.
Hypersensitivity is often described in four classes/types. Fort class is delayed hypersensitivity. Usually this delay is caused by the body reacts. Moreover, the time required to reaction tends to mean that the cells are involved in the reaction.
It is easy to devise examples of delayed hypersensitivity. When people touch the poisonous oak or ivy, it may take at least a day for the skin to react. In this tija, t cells went to work to create a rash that is characteristicsby a signs of the exposure to the antigens of poisonous oak or ivy. Most people exposed to illnesses will also not receive them, but can develop them in a few days or weeks.
instant hypersensitivity reactions are often caused by allergies. Peanut allergic persons could develop serious allergies within seconds after consuming a single peanut. This rapid histamine response can be very dangerous and is usually not delayed. An immediate treatment is required to prevent anaphylactic shock.
One complicated aspect of delayed hypersensitivity may be a chronic condition or constant response to antigens that will fully express several days. Yet when the expression begins, it seems to be an immediate reaction. An example is the rejection of the authorities.
When a person first receives a donor body, it does not seem to be rejected and the apparent expression of refusal may take several days whileT cells marshalations of their forces. Once this rejection has proven, it may still be a delayed reaction, even if the organ obviously begins to fail. While the reaction is delayed hypersensitivity, organ failure occurs simultaneously, so it seems that the reaction to the current state of the process that began a few days ago. To avoid this, medications against rejection are often administered before the cells may respond, leading to less cases of organ failure.
delayed hypersensitivity is not always negative. When people undergo tuberculin skin testing, they must get the results to check about a week later to make evidence of the exposure of tuberculosis. The delayed reaction is simply accepted because the way the body responds to the test and antigen; It is neither good nor bad if people return to the doctor to have the results interpreted. In addition, as with transplantation, the organ can be medically intervention between exposure and reaction to certain substances, which reduces the chances of the severity of the reaction.