Mesh : Adult Aged Antibodies, Monoclonal / adverse effects Antirheumatic Agents / adverse effects Escherichia coli Infections / etiology immunology Etanercept Fatal Outcome Female Humans Immunoglobulin G / adverse effects Immunosuppressive Agents / adverse effects Infliximab Interleukin 1 Receptor Antagonist Protein Legionellosis / etiology immunology Male Meningitis, Listeria / etiology immunology Middle Aged Neoplasm Proteins / adverse effects Opportunistic Infections / etiology immunology microbiology Pneumonia, Pneumocystis / etiology immunology Receptors, Tumor Necrosis Factor Receptors, Tumor Necrosis Factor, Type II Risk Factors Sepsis / etiology immunology microbiology Sialoglycoproteins / adverse effects Tuberculosis / etiology immunology Tumor Necrosis Factor Decoy Receptors