524: SEVERE ACUTE RESPIRATORY INFECTION – PREPAREDNESS (SARI-PREP): A MULTICENTER PROSPECTIVE STUDY. (16th December 2021) - Bhatraju, Pavan; Srivastava, Avantika; Anesi, George; Postelnicu, Radu; Andrews, Adair; Gonzalez, Martin; Kratochvil, Christopher; Kumar, Vishakha; Wyles, David; Lee, Richard; Liebler, Janice; Lutrick, Karen; et al.