Multidrug-Resistant and Extremely Drug-Resistant Pseudomonas aeruginosa in Clinical Samples From a Tertiary Healthcare Facility in Nigeria

Turk J Pharm Sci. 2022 Aug 31;19(4):447-454. doi: 10.4274/tjps.galenos.2021.66066.


Objectives: Pseudomonas aeruginosa has been globally implicated in healthcare-associated infection. The susceptibility pattern of clinical isolates of P. aeruginosa to anti-pseudomonal antibiotics is reported.

Materials and methods: Clinical samples, namely blood, urine, tracheal aspirate, cerebrospinal fluid (CSF), wound swabs, high vaginal swabs, eye, and ear exudates were obtained from patients, processed and identified using standard microbiological protocols. Antibiotic susceptibility testing was undertaken using the Kirby Bauer Disc diffusion method. Results were reported following the Clinical and Laboratory Standards Institute guidelines.

Results: Of 104 P. aeruginosa isolates identified, males (52.88%) had a higher incidence of infection than female (47.11%) patients. The highest prevalence was recorded from wound swabs [46 (44.23%)] followed by ear exudates [23 (22.12%)], urine [22 (21.15%)], while eye exudates and samples from the CSF yielded the least [1 (0.96% each)]. From the antibiogram, imipenem had the highest antibiotic activity (91.3%) followed by polymyxin B (84.6%). The isolates exhibited the highest resistance to ceftazidime (73.1%) and piperacillin-tazobactam (61.5%). The antibiotic susceptibility pattern of P. aeruginosa isolates revealed 7.69% susceptible, 26% resistant, 61% multidrug resistance (MDR), 5% extremely drug resistance (XDR), and an absence (0%) of pandrug-resistant phenotypes.

Conclusion: The study recorded alarmingly high cases of MDR and some XDR phenotypes of P. aeruginosa in University of Port Harcourt Teaching Hospital. It will help identify existing gaps in antimicrobial resistance surveillance and assist in improving public health policies regarding antibiotic stewardship, initiatives, and interventions.

Keywords: Antibiotics; Nigeria; Pseudomonas aeruginosa; antimicrobial resistance; extremely drug resistance; multidrug resistance.