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Background Respiratory viruses (RV), including respiratory syncytial virus (RSV), influenza, parainfluenza virus (PIV), and human metapneumovirus (HMPV), frequently lead to serious complications such as lower respiratory tract infections and death in allogeneic hematopoietic cell transplantation (HCT) recipients. We used a large US claims database to compare the total reimbursement (TR), health resource utilization (HRU) and clinical outcomes between HCT patients with and without RV infections (RVI). Methods We used the Decision Resources Group Real World Evidence Data Repository to identify HCT recipients with date of service for the procedure from 1/1/2012-12/31/2017. We estimated the reimbursements from submitted charges using a reimbursement to charge ratio of 0.425. We examined the study outcomes in the year following HCT in patients with and without RVI. We also used a generalized linear model to determine adjusted TR stratified by the presence or absence of any acute or chronic graft-versus-host diseases (GVHD) after adjusting for age, health plan, underlying disease, stem cell source, number of comorbidities, baseline costs, and follow-up time. Results The study included 13,363 patients, representing 22% of HCTs reported to CIBMTR for the study period, of which 1,368 (10%) were coded with an RVI in the year following HCT: 578 (4%) RSV, 687 (5%) influenza, 166 (1%) PIV, and 181 (1%) HMPV. Unadjusted median TR were $132,395 higher for any RVI ($139,439 RSV, $101,963 influenza, $185,041 PIV and $248,029 HMPV) compared to those without RVI (Table 1). Adjusted TR were significantly higher for patients with any RVI compared to patients without that infection (p&amp;lt; .01) with or without GVHD (Figure 1). Patients with any RVI had significantly longer length of stay (LOS) for the HCT hospitalization, readmission rate and LOS after HCT hospitalization compared to patients without RVI (p&amp;lt; 0.05) (Table 2). A significantly higher proportion of patients with any RVI had pneumonia as compared to patients without that infection, irrespective of presence of GVHD (p&amp;lt; .0001). Table 1: Total healthcare reimbursement within one year of undergoing allogeneic HCT for patients with and without respiratory viral infections Figure 1: Adjusted total reimbursements within one year of undergoing allogeneic HCT for patients with and without respiratory viral infections Table 2: Health resource utilization within one year of undergoing allogeneic HCT for patients with and without respiratory viral infections Conclusion Allogeneic HCT patients with RVI have a significantly higher burden of TR, health resource utilization and worse clinical outcomes such as pneumonia during one year of undergoing HCT, regardless of the presence of GVHD. Disclosures Michael G. Ison, MD MS, AlloVir (Consultant) Francisco M. Marty, MD, Allovir (Consultant)Amplyx (Consultant)Ansun (Scientific Research Study Investigator)Avir (Consultant)Cidara (Scientific Research Study Investigator)F2G (Consultant, Scientific Research Study Investigator)Kyorin (Consultant)Merck (Consultant, Grant/Research Support, Scientific Research Study Investigator)New England Journal of Medicine (Other Financial or Material Support, Honorarium for Video)Regeneron (Consultant, Scientific Research Study Investigator)ReViral (Consultant)Scynexis (Scientific Research Study Investigator)Symbio (Consultant)Takeda (Scientific Research Study Investigator)United Medical (Consultant)WHISCON (Scientific Research Study Investigator) Seung Hyun Moon, MD, MPA, AlloVir (Employee, Shareholder) Zhiji Zhang, MS, AlloVir (Independent Contractor) Aastha Chandak, PhD, AlloVir (Independent Contractor)

195. Economic and Clinical Burden of Respiratory Virus Infections in Allogeneic Hematopoietic Cell Transplantation Recipients