Results and conclusions: The study subjects have an average age 67, 7 ± 16, 5 years old; with a male / female ratio 1, 1/1; The entrance of unknown infections accounted for the highest rate of 43.6%, fever in 90, 9%; E coli and K pneumonia were most common with 58, 2% and 16, 2%, respectively; Mean blood pressure less than 70 mmHg, albumin less than 35g / l and plateles less than 100000 / mm3 were significantly associated with an increased risk of mortality.