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Definition. Primary immunodeficiency disorders â also called primary immune disorders or primary immunodeficiency â weaken the immune system, allowing infections and other health problems to occur more easily.efinition. Primary immunodeficiency disorders â also called primary immune disorders or primary immunodeficiency â weaken the immune system, allowing infections and other health problems to occur more easily.
Primary thrombocytosis, also known as essential thrombocythemia (or ET) , is a disease in which abnormal cells in the bone marrow cause an increase in platelets. The cause is unknown. Secondary thrombocytosis is caused by another condition the patient may be suffering from, such as: 1  anemia due to iron deficiency. 2  cancer.