title: Letter: Azathioprine and severe vaccinia.
mesh_terms: D000328:Adult; D001172:Arthritis, Rheumatoid / Q000188:drug therapy; D001379:Azathioprine / Q000009:adverse effects*; D005260:Female; D006801:Humans; D007165:Immunosuppression Therapy / Q000009:adverse effects*; D014615:Vaccinia / Q000209:etiology*
chemical_list: D001379:Azathioprine