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They subsequently diagnosed the woman with cold agglutinin disease, which can occur for unknown reasons but is sometimes associated with other conditions, such as certain bacterial and viral infections, or certain cancers and autoimmune diseases.

If agglutinin is present and the test is giving a positive reaction, the bacilli will be collected in large clumps.

She improved, telling the doctors she felt less dizzy, which itself is also a symptom of cold agglutinin disease.