![]() Primary ITP is when the ITP is not associated with another disease.It is thought that viral infections might make the immune system become overactive, and start producing abnormal antibodies. Among adults, young women are more likely to develop ITP than any other group, for reasons unknown. Estimates suggest that ITP affects one in every 10 000 children in adults it affects approximately one in 20 000. ITP is more common among children than adults, most often occurring around two to four years of age. ![]() In many cases of acute ITP, the platelet count will rise again within a few weeks and return to normal within a few months. Since ITP targets mature platelets as they circulate through the spleen, the ‘newborn’ platelets inside bone marrow are healthy and normal. In other cases, the cause is unknown (idiopathic). Antibodies that attack the body are called autoantibodies. For reasons unknown, these infections prompt the person’s lymph tissues and spleen (an organ that helps filter the blood) to make antibodies that attack the platelets in their blood. Normally, the immune system recognises ‘self’ and doesn’t attack tissues or organs of the body.ĭoctors think that some types of viral infections trigger ITP. The body’s immune system is a specialised system of cells and chemicals that fight infections. Chronic ITP has similar symptoms to acute ITP, except that it lingers for longer than six months.
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