Chemical Inactivant X– potency (ED50) X– ED50 Ascorbic acid 0.0026 0.0022 0.0024 Beta-propiolactone 0.007 0.005 0.006 Formalin 0.01 0.012 0.011

Table 1: Determination of inactivated Rift Valley Fever virus vaccine Potency (ED50).