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A 58-year-old woman developed autoimmune haemolytic anaemia during treatment with cotrimoxazole [sulfamethoxazole/trimethoprim].
The woman presented to the emergency department with weakness and fatigue. Laboratory investigations showed a hemoglobin concentration of 5.6 g/dL, a mean corpuscular volume of 116.9 pm3, a mean corpuscular hemoglobin concentration of 40 g/dL and a reticulocyte count of 16%. Haemolysis markers were positive, with a high serum LDH concentration of...