Staphylococcus aureus is a human pathogen as well as commensal bacteria. S. aureus has colonized around 30% of the human population. This study aimed to diagnose Staphylococcus aureus by molecular techniques, correlate the resistance against selected antimicrobial substances with the presence of the lukf-pv gene, and find the sequence of lukf-pv gene for the isolates obtained to investigate the mutations of those obtained isolates. This study included 60 patients diagnosed by the hospital with a urinary tract infection in Teaching Medical City Hospital, Baghdad, and Al-Yarmouk Teaching Hospital, between January 2021 and July 2021. The isolates were cultured on a blood agar overnight; then, isolates were diagnosed by VITEK as S. aureus. DNA has been isolated from all the included samples. A specific region of the 16SRNA gene has been amplified to diagnose S. aureus by molecular techniques. Then possession of the lukf-pv gene was tested by PCR, then amplified products were sequenced to detect the mutations within the lukf-pv gene. The finding appeared that blood group O+ has the highest rate of bacterial infection, the lowest is O- (1.7%), and the highest rate is shown within people not suffering from complicated diseases (65%). Of the 60 isolates, 60 (100%) were confirmed by 16sRNA gene amplification and were positive, among which 37 (61.6%) were lukf-pv positive. Results of the lukf-pv gene sequences showed around 501 bits score and 96% compatibility (ID: CP076105.1). The current study showed that antibiotics Cefoxitin, Benzylpenicillin, Oxacillin, Clindamycin, Fusidic acid, Rifampicin, Erythromycin, Vancomycin, and Teicoplanin had the highest resistance to antibiotics and as follow;100 %, 100 %, 40.54 %, 27.03 %, 27.03 %, 16.22 %, 13.51 %, and 10.81 %, respectively. Keywords: Staphylococcus aureus, 16sRNA and lukf-pv genes
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