Infections by Pseudomonas aeruginosa and Antibiotic Resistance Pattern of the Isolates from Dhaka Medical College Hospital

Pseudomonas aeruginosa is one of the most common gram-negative microorganisms identified in the clinical specimens of hospital admitted patients. This was a retrospective study done among the patients attending Dhaka Medical College Hospital during January to December, 2006. A total 294 strains of P. aeruginosa were isolated of which 206 (70%) were from admitted patients and 88 (30%) from outpatients. Some 175 (60%) of the isolates were from males while 119 (40%) from females. Majority of the patients (141, 41.2%) were aged between 21-40 years and 102 (34.7%) were below 20 years. A significant proportion (about 45%) of the patients were from casualty wards, surgical outdoor, ear-nose-throat outdoor and burn unit. Four of the clinical specimens including wound swab, pus, aural swab and urine comprised of 279 (95%) of the total samples. The bacteria isolated were identified by colony morphology, microscopy and relevant biochemical tests. Antimicrobial sensitivity pattern was tested using standard guidelines. Almost all of the P. aeruginosa isolates were resistant to cefixime (93.3%) and co-trimoxazole (93.5%), majority were resistant to ceftazidime (86.8%), gentamycin (77.3%) and ciprofloxacin (75.5%). The result of the study shows that imipenem is the most effective drugagainst P. aeruginosa, followed by amikacin and ciprofloxacin.Bangladesh J Med Microbiol 2007; 01 (02): 48-51