vel 3 (BSL-3) laboratory in Vero E6 cells from the Day 4 nasopharyngeal swab (NPS) and nasopharyngeal aspirate (NPA) specimens (Table). The samples were inoculated into the cells for 1 h at 37 °C and 5% CO2 and fresh culture medium (Eagle's minimum essential medium (EMEM) supplemented with 2% fetal bovine ser