Before revision:  The advantage of modeling the pandemic using the reaction mechanism is that the rate constants have sound physical interpretation and could be modeled using the collision rate theory. As such, the infection rate constant is  shown to be linearly related to the square of the virus laden droplet lifetime.
After revision:  The advantage of modeling the pandemic using the reaction mechanism is that the rate constants have sound physical interpretation . The infection rate constant is shown to be linearly related to the square of the virus laden droplet lifetime.