English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Background The emergence of community-acquired methicillin-resistant Staphylococcus aureus (MRSA) in the late 1990s-early 2000s complicated the empiric management of suspected staphylococcal infection in children. Rising clindamycin resistance rates in many communities adds further to management challenges. Ceftaroline, an anti-MRSA cephalosporin, represents an attractive therapy option. Little data are available, however, regarding the frequency of reduced susceptibility (RS) to ceftaroline among MRSA isolates from a general pediatric population. Methods Isolates were selected from an ongoing S. aureus surveillance study at Texas Children’s Hospital. Invasive MRSA isolates from 2015-2018 were included. Isolates were initially screened for ceftaroline RS with E-test; all isolates with a ceftaroline E-test MIC ≥ 1.5µg/ml underwent ceftaroline broth dilution. Ceftaroline RS was regarded as an MIC ≥ 2 µg/ml; full ceftaroline resistance was defined as an MIC ≥ 8 μg/ml. Accessory gene regulator (agr) groups were characterized by PCR. Results 201 viable isolates were included. The ceftaroline MIC50 and MIC90 were 0.5 and 1 µg/ml, respectively (Figure 1). Six isolates had MIC ≥ 2 µg/ml (2.9%) with two having MIC ≥ 8 µg/ml (0.9%). All ceftaroline RS isolates were from healthcare associated infections. Ceftaroline RS isolates were more often associated with clindamycin-resistance and agr group II (Figure 2). Infections with ceftaroline RS were associated with central venous lines, recent ICU admission, preceding antibiotic exposure (specifically cephalosporins) and prior MRSA infection. One subject with MRSA CLABSI had a ceftaroline susceptible MRSA infection followed &amp;lt; 1 month later by a ceftaroline resistant infection (MIC =32 μg/ml); the isolates were identical by PFGE. Only 3 subjects had previously received ceftaroline, none of which subsequently developed a ceftaroline RS isolate. Figure 1. Ceftaroline MIC Distribution Figure 2. Clinical And Microbiologic Associations with Reduced Ceftaroline Susceptibility Conclusion Ceftaroline RS occurs in 2.9% of invasive MRSA isolates in children and is most prominent among healthcare-associated infections. These isolates were associated with clindamycin resistance and agr group II. While ceftaroline RS is rare among invasive MRSA infections, the lack of preceding ceftaroline exposure is concerning and warrants careful surveillance. Disclosures Sheldon L. Kaplan, MD, Allergan (Research Grant or Support)Pfizer (Grant/Research Support) Jonathon C. McNeil, MD, Allergan (Research Grant or Support, Allergan provided ceftaroline powder for use in studies described in this abstract)

open forum infectious diseases

1367. Reduced Ceftaroline Susceptibility Among Invasive MRSA Isolates at a Tertiary Children’s HospitalReduced Ceftaroline Susceptibility Among Invasive MRSA Isolates at a Tertiary Children’s Hospital