Journal of Pure and Applied MicrobiologyVol. 9 No. 1

Molecular Characterization of Methicillin Resistant Staphylococcus aureus Isolated from Pediatrics with UTIs

Hamid Reza Safaei1, Hamid Pirasteh2, Amir Farshid Fayyaz3 and Zahra Pournasiri4*

1Department of Pediatric Nephrology, AJA University of Medical Sciences, Tehran, Iran 2Department of Nephrology, AJA University of Medical Sciences, Tehran, Iran 3Department of Legal Medicine , AJA University of Medical Sciences, Tehran, Iran 4Department of Pediatric Nephrology , Shahid Beheshti University of Medical Sciences, Tehran, Iran

Received on 29 july 2014 and accepted on 10 september 2014

 

ABSTRACT

Staphylococcus aureus causes a variety of severe infections such as urinary tract infections. At present, 3050% of S. aureus isolates from Iran are methicillin resistant (MRSA). The goals of this study were to identify the distribution antibiotic resistance properties in S. aureus isolates of pediatric patients. One- hundred and fifty five urine samples were collected from pediatric patients suffered from UTIs. Samples were cultured immediately and those that were S. aureus-positive were analyzed for the presence of antibiotic resistance genes. We found that 66 out of 155 samples (42.58%) were positive for S. aureus. The highest prevalence of bacterium was seen in the cases of pyelonephritis (43.8%). S. aureus isolates had the highest antibiotic resistance against ampicillin (90.9%), tetracycline (90.9%), erythromycin (87.8%), methicillin (83.3%), oxacillin (78.7%) and trimethoprim-sulfamethoxazole (77.2%). MecA (75.7%) and aacA-D (75.7%) were the most commonly detected antibiotic resistance genes. All of the MRSA strains were also resistant against ampicillin, tetracycline and erythromycin. Totally, 54.5% of strains were PVL positive and 86.1% of PVL positive strains were resistant to methicillin. Although the frequency of MRSA isolates in the current study was intermediate, resistance to other antibiotics was high and most of the isolates were found to be MDR. Regular surveillance of hospital-associated infections and monitoring of their antibiotic sensitivity patterns are required to reduce the prevalence of MRSA.

Keywords : Staphylococcus aureus, methicillin resistant, Pediatric, Urinary tract infections, Iran