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Which of the following external factor does NOT trigger the immune system when acquired aplastic anemia is detected?

Which of the following external factor does NOT trigger the immune system when acquired aplastic anemia is detected? Correct Answer Weather changes

Deficiencies of hematopoietic stem cells and progenitor cells can lead to cause acquired aplastic anaemia. It is also caused by factors such as decrease in the cell count associated with bone marrow as well as abnormal changes in peripheral blood. It primarily affects children, young adults, and those over 60 years of age. External factors like coming in contact with viruses like HIV or toxic chemicals and even harmful radiations or chemotherapy during cancer affect T cells which further cause stem cell depletion. This leads to a weakened immune system and can be fatal in some cases. 

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