In vitro activity of ceftaroline and comparators against staphylococcus aureus isolates: Results from 6 years of the ATLAS program (2012 to 2017)

Abstract

Background: Ceftaroline is effective against methicillin-resistant Staphylococcus aureus (MRSA), but the resistance patterns still need to be defined. This study aimed to investigate the susceptibility of S. aureus to ceftaroline and comparator antimicrobial agents in patients hospitalized due to infection and to observe the patterns among different regions and over the years. Methods: The Antimicrobial Testing Leadership And Surveillance (ATLAS) program includes medical centers located in five geographical regions (Europe, Asia-Pacific, South America, Africa-West Asia, and the United States). The isolates were collected from different specimens from patients hospitalized between 2012 and 2017 due to documented complicated skin and soft tissue infection, complicated intra-abdominal infection, complicated urinary tract infection, lower respiratory tract infection, and bloodstream infection. Results: During the study period, 61,045 isolates were tested, including 35,837 MRSA isolates (58.7%) and 25,208 methicillin-sensitive S. aureus (MSSA) isolates (41.3%). For MRSA, the minimal inhibitory concentration (MIC)50, MIC90, and MIC range of ceftaroline were 0.5, 2, and 0.015-64 µg/mL. The proportion of susceptibleMRSAstrains was 89.3%. The proportion of resistant MRSA strainswas 0.7%. The susceptibility of all S. aureus,MRSA, andMSSA strains to ceftaroline remained relatively constant from 2012 to 2017. The susceptibility to ceftaroline of S. aureus,MRSA, and MSSA strains from the United States, Europe, South America, and Africa/West Asia was high, while the susceptibility of the strains from Asia-Pacific was lower, especially for MRSA. Conclusion: This study reveals the patterns of ceftaroline susceptibility of MRSA and MSSA around the world and over 6 years.