simulation of organism simulation of organism awaiting effect of control measure A simulated organism that participates in a particular control measure that has not yet been effective. This concept represents a simulated organism that has received a control measure such as vaccination in which a period of time must elapse before the benefit of the control measure accrues. A simulated organism is ‘awaiting efficacy’ if ‘efficacy delay’ (e.g. the concept ‘antiviral efficacy delay’ for the particular simulated control measure is greater than the elapsed time between application of the control measure and the current simulated time.