Molecular detection of virulence genes in pseudomonas aeruginosa isolated from different clinical infections

Abstract

Objective: To isolate pseudomonas aeruginosa from different clinical specimens, and to detect virulence factors.
Method: The cross-sectional study was conducted at Al-Zharr Hospital and private clinics in Kut city of Wasit province
in Iraq from October 15, 2021, to April 30, 2022, and comprised samples obtained from different patient sites, such as
wound swabs, ear swabs, urine samples, burn swabs and respiratory tract swabs. The samples were subjected to
molecular testing using, among other tools, polymerase chain reaction. The isolates were cultured on different media,
such as blood agar, MacConkey agar and cetrimide agar, and were further diagnosed by biochemical testing. Data
was analysed using SPSS 20.
Results:Of the 212 samples, there were 70(33%) wound swabs, 53(25%) ear swabs, 41(19.3%) urine samples, 33(15.6%)
burn swabs and 15(7%) respiratory tract swabs. Pseudomonas aeruginosa was identified in 54(25.47%) isolates via
culture-based characterisation. All 54(100%) isolates were positive for mexR and toxA on polymerase chain reaction,
44(81.48%) were positive for exoU gene, 43(79.62%) for exoT gene, 36 (66.66) for exoT gen, 35(64.81%) for plcH, gene
and 14(25.92 %) for exoS gene.
Conclusions: Wound swabs were found to be the most common site for pseudomonas aeruginosa, followed by ear
swabs and urine samples.
Keywords: Pseudomonas aeruginosa, Virulence, Agar, Cetrimonium, Virulence, Burns, Polymerase chain reaction, DNA.