title: Pneumocystis carinii pneumonia following methotrexate therapy for rheumatoid arthritis.
mesh_terms: D000368:Aged; D001172:Arthritis, Rheumatoid / Q000188:drug therapy*; D005260:Female; D006801:Humans; D008727:Methotrexate / Q000009:adverse effects*; D011020:Pneumonia, Pneumocystis / Q000139:chemically induced*
chemical_list: D008727:Methotrexate