Objectives: To determine the pathogens associated with health-care associated pneumonia and describe their patterns of antimicrobial resistance. Subjects: 133 bacteria and Candida spp. Isolated from 90 patients with nosocomial pneumonia from September 2008 to April 2009 in the intensive descriptive study. Sensitivity testing was per:fonned by disk diffusion method. Results: There are 3 most common isolated microorganisms contributing to nosocomial pneumonia included Acinetobacter baumannii (45 percent). Candida spp. (19.5 percent) and Pseudomonas aeruginosa (17.3 percent). Acinetobacter baumannii and Pseudomonas aeruginosa were resistant to all commonly used antibiotics. The percentage of resistance to used antibiotics varied from 80.4 percent to 96.5 percent for Acinetobacter baumannii and from 57.9 percent to 84.2 percent for Pseudomonas aeruginosa. Pseudomonas resistant to imipenem were 89.3 percent and 57.9 percent. The study shows that it is necessary to develop policy of appropriate antibiotic use and set up reporting system of antimicrobial microol1!anisms in Bach Mai Hospital.
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