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You have not mentioned dose of
Tryptomer. Studies have shown that Tryptomer can cause
bone marrow suppression and leucopenia. Has she been tested for
immune deficiency disease like
HIV. There could be manty causes for leucopenia. Severe infection can be associated with it. She needs a peripheral blood smear to look for any abnormal cells and also possibly a bone marrow aspirate/
biopsy to look for the cause of this problem. Consult with your Doctor about the possible causes in her case and proper management. She needs to avoid source of infection. Proper handwashing is needed. Usage of handkerchief while going outside may reduce chances of spread of infection because leucopenia means high chance of getting infections.