ALLERGIC PURPURA CAUSES |
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Allergic Purpura is caused by a reaction involving
antibodies, special proteins of the immune system. Antibodies are
designed to bind with foreign proteins, called antigens. In some
situations, antigen-antibody complexes can become too large to
remain suspended in the bloodstream. When this occurs, they
precipitate out and become lodged in the capillaries. This can cause
the capillary to burst, allowing a local hemorrhage.
The source of the antigen causing Allergic Purpura is unknown. Antigens may be
introduced by bacterial or viral infection. More than 75% of
patients report having had an infection of the throat, upper
respiratory tract, or gastrointestinal system several weeks before
the onset of Allergic Purpura. Other complex molecules can act as antigens as
well, including drugs such as antibiotics or vaccines. Otherwise
harmless substances that stimulate an immune reaction are known as
allergens. Drug allergens that may cause Allergic Purpura include penicillin,
ampicillin, erythromycin, and quinine. Vaccines possibly linked to
Allergic Purpura include those for typhoid, measles, cholera, and yellow fever. |
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| ALLERGIC PURPURA RELATED ITEMS |
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