Susceptibility of multidrug-resistant nosocomial pathogens for the new antimicrobial agents in Jordan

Background To study resistance rates of multidrug-resistant bacteria (MDR) for new Cephalosporines before their widespread use in Jordan. Methods During September 2019 - May 2020, MDR-bacteria were prospectively collected from microbiology laboratories of three hospitals, susceptibility of the extended-spectrum β-lactamases-producing Enterobacteriaceae (ESBL), K. pneumoniae-carbapenemases strains (KPC), carbapenem-resistant Enterobacteriaceae (CRE), carbapenem-resistant P. aeruginosa (CRPa), carbapenem-resistant A. baumannii (CRAb), and Methicillin-resistant Staphylococcus aureus (MRSA) were tested. Demographic details for patients were identified. Antimicrobials evaluated were ceftazidime-avibactam, ceftolozane-tazobactam, and ceftobiprole medocaril. Results Non-duplicate 263 MDR clinical isolates were collected from sterile sites; ESBL (128), P. aeruginosa (57), MRSA (37), KPC (22), A. baumannii (11), and CRE (n = 8). The age was dominated by the older age group (Age > 64, Pearson R = 0.985, R2 = 0.969, P = 0.000). Males were 143 and females 107 (P < 0.000). There were (194) isolate from the wards and (55) were from the ICUs. Sources were urine (96), blood (36), soft tissues (49), abdomen (24), URT (14), and osteo-skeletal (12). Clinical diagnoses were: UTI (90). Bacteremia (36), SSTI (45), IAI (23), pneumonia (17), URTI (13), osteomyelitis (11), and diabetic foot (6). The susceptibility of the ESBL-producing bacteria was 100% for meropenem, 99% for ceftazidime-avibactam, and 90% for ceftolozane/tazobactam. P. aeruginosa was, 73% for ceftazidime-avibactam, 62% susceptible to ceftolozane/tazobactam, 62% for meropenem, and 45% to ceftobiprole. CRE was 38% susceptible to ceftazidime-avibactam and KPC 15%, while ceftolozane-tazobactam susceptibility was zero, and 14% for CRE, and 0% for Ceftobiprole Medocaril. A. baumannii was 13% susceptible to ceftazidime-avibactam, meropenem 9%, and 2% for ceftolozane/tazobactam Conclusion Ceftazidime-avibactam and ceftolozane/tazobactam may be useful alternatives for the treatment of ESBL-producers and P. aeruginosa, though the MDR-bacteria demonstrated some resistance to the newly introduced agents before their widespread use in the country.