Neutralization of irradiated and heat-inactivated serum samples were assessed in Vero UNC cells. Neutralization assays with VSV-TAFV-GFP were performed as previously described [16 (link)]. Samples were run on the FACSymphony A5 Cell Analyzer (BD Biosciences, Mississauga, ON, Canada) where the GFP-positive cell count was measured and data analysed on FlowJo V10.