Transfusion-associated microchimerism (TA-MC) refers to the long-term persistence of a small population of donor-derived white blood cells (specifically, hematopoietic stem or progenitor cells) in the recipient's circulation or tissues after a blood transfusion. The primary mechanism is thought to be the transfusion of immunocompetent donor lymphocytes (and potentially stem cells) that engraft in the immunocompromised recipient. The recipient's immune system fails to eliminate these donor cells, allowing them to establish a low-level, stable chimeric state. This is more likely to occur in severely immunocompromised patients (e.g., trauma patients, those undergoing massive transfusion, or immunosuppressed individuals) and when non-leukoreduced blood is used. TA-MC is usually asymptomatic but has been investigated as a potential cause of chronic conditions like graft-versus-host disease (GVHD) or autoimmune disorders, though a direct link is not firmly established.

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Zambia

• loveness Phiri – 1084 pts

• Visual Pathway Lesions
• Positive and Negative Symptoms
• Hallucinations and Delusions
• Antipsychotic Medications
• Emergency: Environmental Emergencies