The aggressive clinical course of pneumococcal endocarditis. A retrospective study was conducted between 2000 and 2005 in five patients with pneumococcal endocarditis were diagnosed at our center. Three female and 2 males, 13 to 76 year-old, were attended. Most of them had left valve endocarditis and were suffering from predisposing conditions. All of them developed distant complications as embolism or septic metastases. Two patients were successfully operated. Surgery was considered in another one but it was discarded due to her poor general condition. This was the only death in the series.