The Hartley guinea pig-adapted EBOV (full designation: Ebola virus/UTMB/C.porcellus-lab/COD/1976/Yambuku-Mayinga-GPA, abbreviation: GPA-EBOV/Yam-May) was obtained from Dr. Thomas Geisbert (University of Texas Medical Branch at Galveston, Galveston, TX, USA). VERO C1008 (E6) cells, Kidney (African green monkey), Working Cell Bank, NR-596 were obtained through BEI Resources (National Institute of Allergy and Infectious diseases [NIAID], National Institutes of Health [NIH], Manassas, VA). The IRF0147_EBOV Master stock was propagated using Minimum Essential Medium-alpha, GlutaMAX, no nucleosides (Gibco, ThermoFisher Scientific) supplemented with 2% US-origin, certified, heat-inactivated fetal bovine serum (HI-FBS, Gibco, ThermoFisher Scientific). Following harvest, HI-FBS was QS'd to 10% final concentration prior to cryopreservation.