Source of nosocomial infection and associated mortality
For 1360 patients admitted into our study, 89 patients (6.54%) acquired microbiological documented NI. Among the 89 patients, 21 patients died with the mortality rate of 23.60%. For the other 1271 patients without NI, the mortality rate was only 2.28% (29/1271, p<0.00). 56 patients (62.92%) developed a single infection while 33 patients (37.08%) experienced two or more different nosocomial infections. A total of 134 strains of pathogenic bacteria were detected. 98 (73.13%) of them were isolated from sputum and 32 (23.88%) were from blood. 3 (2.24%) SSI were detected in our study (2 superficial SSI, 1 mediastinitis). Only 1 (0.75%) were isolated from urine. The details of source of NI and associated mortality were demonstrated in Figure 1. The distribution of pathogens for each type of NI were different. Microorganisms causing pneumonia were Gram-negative bacilli while the main pathogens of BSI were Gram-positive cocci (Figure 2).