infection requiring systemic active therapy antibiotics antibiotic intravenous treatment days bacterial fungal viral infection active uncontrolled infections systemic requiring antibiotics infections active uncontrolled requiring antibiotics systemic illnesses opportunistic patients medical pulmonary obstructive disease chronic severe requiring copd antibiotics hospitalization history malignancy active years history concurrent treatment second prior requiring patients infection active uncontrolled patients ongoing antibiotics eligible presence evidence systemic uncontrolled medical severe disease active infection conditions seizures concurrent disorder