287. Value of Methicillin Resistant Staphylococcus aureus Nasal Swab Screening for Predicting Invasive Methicillin Resistant Staphylococcus aureus Respiratory Infection in Pediatric Patients with Artificial Airways Kimberly Mcmahon, MD; Shannon Chan, PharmD; Abigail Freedman, MD; Critical Care, Nemours/Alfred I duPont Hospital for Children, Wilmington, DE; Infectious Diseases, Nemours/Alfred I....