Background: This study aimed to analyze the distribution of pathogens and antimicrobial resistance in bone and joint infections (BJIs) among children under four years old.
Methods: A retrospective analysis was conducted on the clinical data of children under four years old who received inpatient treatment for BJIs at the Children's Hospital of Soochow University between January 2016 and December 2022. Results of bacterial culture and antimicrobial resistance were analyzed.
Results: Among the 131 patients, 52 (39.7%) showed positive bacterial culture results. There were Gram-positive (G+) bacteria detected in 38 strains (73.07%), Gram-negative (G-) bacteria in 12 strains (23.08%), and fungi in 2 strains (3.85%). Thirty-one strains of Staphylococcus aureus (S. aureus) were detected (59.62%), including 7 MRSA strains (22.58%). The resistance rate of G+ bacteria to penicillin was 72.97%, while resistance to erythromycin and clindamycin was approximately 50%. No resistance was found against linezolid, vancomycin, and teicoplanin. G- bacteria showed a sensitivity of 100% to carbapenems, including meropenem, ertapenem, and imipenem, a resistance rate of 91.67% to ampicillin-sulbactam, and relatively high resistance rates to compound sulfamethoxazole, ampicillin/sulbactam, and piperacillin.
Conclusions: Regional variations existed in the distribution of pathogens and antimicrobial resistance in children under four years old with BJIs. In our hospital, the most common pathogen is S. aureus, with MRSA accounting for approximately one-fourth of all S. aureus patients. Additionally, extended-spectrum β-lactamase (ESBL)-producing G- bacteria have been identified, underscoring the importance of careful consideration during empirical antibiotic therapy.
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