213. Assessment of Compliance with Order Set and Bundle for Management of Staphylococcus aureus Bacteremia

Abstract Background Staphylococcus aureus (S. aureus) is an aerobic gram-positive coccus that causes a variety of infections. S. aureus bloodstream infections, also known as bacteremias, have significant morbidity and mortality and are difficult to eradicate. A single-center study showed a 9.4% recurrence rate for S. aureus bacteremia, despite adequate treatment. The Infectious Disease Society of America (IDSA) recognizes the seriousness of S. aureus infections, particularly methicillin-resistant S. aureus (MRSA), and has released guidance for treatment of these infections. Guidance for S. aureus bacteremias include identification and removal of the source and early optimization of antibiotics. Serial imaging and laboratory monitoring, including repeat blood cultures, are also necessary to establish the duration of therapy, ensure microbiologic eradication, and reduce the risk of long-term complications. Due to the complexity of S. aureus bacteremia, early involvement of infectious diseases (ID) specialists is strongly recommended. Methods This retrospective, single-center study was designed to evaluate the current management of S. aureus bacteremias, including compliance to the elements of the S. aureus order set and bundle. Patients 18 years and older who had a positive blood culture for S. aureus were included in this study. Recurrence of S. aureus infection was assessed at 6 months. Data was analyzed to compare patients with and without ID consults. Results Eighty-four patients met inclusion criteria. ID consultation resulted in a higher percentage of patients achieving 100% compliance with the bundle elements compared to patients without ID consults (73% vs 25%, respectively; p=0.009). For further breakdown of compliance see Table 1. No statistical difference was detected in recurrence rates (11% vs 33%, respectively; p=0.18) or mortality (8% vs 25%, respectively; p= 0.17) possibly due to the small sample size. Table 1. Outcomes Conclusion ID specialist involvement for the treatment of S. aureus bacteremia resulted in greater compliance with the S. aureus bacteremia bundle. No statistical difference in recurrence or mortality rates was detected. Disclosures All Authors: No reported disclosures


Session: P-10. Bacteremia
Background. Many states have reported that the incidence of invasive bacterial and viral infections has risen alongside rates of opiate use and injection drug use. The aim of this exploratory project is to characterize the incidence of invasive bacterial infections (IBI) over time in a national Veteran population, describe screening for substance use among Veterans with IBI, and assess engagement in harm reduction services.

Methods.
A national, multicenter, retrospective cohort of Veterans admitted to the Veterans Health Administration (VA) between 10/1/2008 -9/30/2018 with a positive blood culture was created using electronic health record (EHR) data. Patients' demographics, clinical characteristics, microbiologic cultures, prescription history, laboratory values, and administrative coding data were extracted from the EHR. All analyses were performed in Microsoft Excel.
Results. Among 5,158,137 inpatient admissions during the study period, we identified 257,926 unique patients with bacteremia (5.0%). The incidence of bacteremia/sepsis increased consistently during the study period, rising from 2.29 per 10,000 patient-days to 5.97 per 10,000 patient-days across the national VA healthcare system ( Figure 1). Among Veterans with bacteremia, 17,436 (6.8%) had prior history of substance use and 24,927 (9.7%) had a history of hepatitis C virus infection. In 196,295 cases (76.1%), no urine toxicology screening was completed or the result was negative. 34,005 (13.2%) of patients with bacteremia had at least one urinary toxicology positive for opiates and of these, 6,173 (18.1%) had documentation of a prescription for either naltrexone or buprenorphine/naloxone prior to admission or on hospital discharge.
Conclusion. Similar to findings in other populations, the incidence of IBI has steadily increased within the national VA. Despite limited screening, a high proportion of patients admitted to the VA with IBI were found to have underlying substance use. Additional work, including increased screening, is needed to assess the uptake of evidence-based interventions, such as naloxone, and to identify optimal strategies for improving adoption of other harm reduction services in this population.
Disclosures. Background. Staphylococcus aureus (S. aureus) is an aerobic gram-positive coccus that causes a variety of infections. S. aureus bloodstream infections, also known as bacteremias, have significant morbidity and mortality and are difficult to eradicate. A single-center study showed a 9.4% recurrence rate for S. aureus bacteremia, despite adequate treatment. The Infectious Disease Society of America (IDSA) recognizes the seriousness of S. aureus infections, particularly methicillin-resistant S. aureus (MRSA), and has released guidance for treatment of these infections. Guidance for S. aureus bacteremias include identification and removal of the source and early optimization of antibiotics. Serial imaging and laboratory monitoring, including repeat blood cultures, are also necessary to establish the duration of therapy, ensure microbiologic eradication, and reduce the risk of long-term complications. Due to the complexity of S. aureus bacteremia, early involvement of infectious diseases (ID) specialists is strongly recommended.
Methods. This retrospective, single-center study was designed to evaluate the current management of S. aureus bacteremias, including compliance to the elements of the S. aureus order set and bundle. Patients 18 years and older who had a positive blood culture for S. aureus were included in this study. Recurrence of S. aureus infection was assessed at 6 months. Data was analyzed to compare patients with and without ID consults.
Results. Eighty-four patients met inclusion criteria. ID consultation resulted in a higher percentage of patients achieving 100% compliance with the bundle elements compared to patients without ID consults (73% vs 25%, respectively; p=0.009). For further breakdown of compliance see Table 1. No statistical difference was detected in recurrence rates (11% vs 33%, respectively; p=0.18) or mortality (8% vs 25%, respectively; p= 0.17) possibly due to the small sample size. Background. The ePlex BCID Gram-Negative (GN) panel utilizes electrowetting technology to detect the most common causes of GN bacteremia (21 targets) and 6 antimicrobial resistance genes from positive blood culture bottles. Rapid detection of extended spectrum β-lactamases (ESBL; CTX-M), carbapenemases (KPC, NDM, IMP, VIM, OXA 23/48), and highly resistant bacteria such as Stenotrophomonas maltophilia enables early optimization of antimicrobial therapy.
Methods. In this prospective study, we evaluated the performance of the BCID-GN panel compared to traditional standard of care culture and susceptibility testing with organism identification using the BioMerieux Vitek MS Matrix Assisted Laser Desorption Ionization (MALDI) Time of Flight mass spectrometry. Samples submitted for standard of care testing in Biomerieux BacT/Alert resin FA/FN blood culture bottles on the BacT/Alert VIRTUO automated blood culture system with GN bacteria on direct exam (n=108) were included.
Results. All but two GN bacteria identified by MALDI were represented on the BCID-GN Panel (106/108, 98.1%) and most tests (107/ Background. The long-standing paradigm is that almost all BSIs stem from a single, clonal organism ("single-organism" hypothesis). We hypothesized that CGpositive BCs were comprised of genetically diverse strain variants.
Methods. Five to ten CG colonies were isolated from positive BC bottles from ten distinct patients (pts) for a total of 94 clones, which underwent NextGen shortread sequencing (Illumina). Variants were analyzed using SNPeff, and a phylogeny was constructed with Maximum Likelihood method.
Results. BCs harbored a diverse population of CG strains that were unique to each pt [ Fig. 1]. All strains were genetically distinct, differing by unique SNPs and insertions-deletions (indels) [Fig. 2-3]. SNPs were ~8-fold more common than indels. Individual genomes from the same time point in the same pt exhibited consistent magnitude of variations relative to reference genome; however, variations were unique, pointing to significant genomic variability that could be both intra-and interclonal. The number of variant sites for within-pt pairwise clone comparisons ranged from 1924-8500. There were 124,145 variant sites when all clones are compared. Roughly half of all SNPs were identical in different samples from a given pt; the remainder were present/absent in at least one sample per pt. Long-read WGS revealed strains with structural variants in each pt, including chromosomal recombinations and gene duplications that were not evident by short-read WGS. A genomic phylogeny construction showed that 94 clones spanned 3 distinct clades that were distinct from the reference strain. Finally, comparison of non-synonymous mutations among intra-pt clones showed overwhelming overrepresentation of adhesin and adhesin-like genes, pointing to possible importance in host adaptation.