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Background  Despite widespread use, the optimal implementation and clinical impact of FilmArray Meningitis Encephalitis Panel (MEP; Table 1) multiplex PCR testing of cerebrospinal fluid (CSF) in children with suspected (CNS) infections is unknown.  Table 1: FilmArray Meningitis Encephalitis Panel Test CharacteristicsMethods  A pre-post quasi-experimental cohort study to investigate the impact of implementing MEP using a rapid CSF diagnostic stewardship program was conducted at Children’s Hospital Colorado (CHCO). MEP was implemented with EMR indication selection to guide testing to children meeting approved use criteria: i. infants < 2mo, ii. immunocompromised, iii. encephalitis, iv. > 5 WBCs in CSF. Positive results were communicated with antimicrobial stewardship real-time decision support (Fig 1). All cases with CSF obtained by lumbar puncture (LP) sent to the CHCO microbiology laboratory meeting any of the 4 criteria above were included with pre-implementation controls (2015-2016) compared to post-implementation cases (2017-2018). Primary outcome was time-to-optimal antimicrobials (time from LP to 1 st  dose of antimicrobials targeted to identified pathogen, or cessation when no treatable pathogen identified).  Figure 1: Rapid Cerebrospinal Fluid Diagnostic Stewardship Program Intervention DesignResults  Post-implementation (n=1127) and pre-implementation (n=1124) group characteristics are in Table 2. Following implementation, MEP was sent in 72% of cases, largely replacing pathogen-specific singleplex CSF testing (Table 3). Time-to-optimal antimicrobials decreased by 10 hours (p< 0.0001; Fig 2). There were no differences in time-to-effective antimicrobials, hospital admissions, antimicrobial starts or length of stay. Time-to-positive CSF results was faster (4.8 vs. 9.6 hrs, p< 0.0001), IV antimicrobial duration was shorter (24 vs 36 hrs, p=0.004) with infectious neurologic diagnoses more frequently identified (15% vs. 10%, p=0.03). Overall, 3% had bacterial and 9% viral CNS infection identified. Enterovirus (n=128) was most common, then HSV (n=28) and parechovirus (n=17) with similar detection rates between groupsConclusion  Implementation of MEP with a rapid CNS diagnostic stewardship program improved antimicrobial use with faster results shortening empiric therapy. Routine MEP testing in high-yield cases rapidly detects common viral causes and rules out bacterial targets to enable antimicrobial optimization    Disclosures    Samuel R. Dominguez, MD, PhD ,  BioFire Diagnostics  (Consultant, Research Grant or Support) DiaSorin Molecular  (Consultant) Pfizer  (Grant/Research Support)  Samuel R. Dominguez, MD, PhD , BioFire (Individual(s) Involved: Self): Consultant, Research Grant or Support; DiaSorin Molecular (Individual(s) Involved: Self): Consultant; Pfizer (Individual(s) Involved: Self): Grant/Research Support

1019. Clinical Impact of a Rapid Cerebrospinal Fluid Diagnostic Stewardship Program for Suspected Central Nervous System Infections in Children