Before revision:  In addition, the reduction in transmission associated with physical distancing between the host and susceptible as well as the level of physical activity  of the host and /or the susceptible in enhancing transmission risk, is also examined .
After revision:  In addition, the reduction in transmission risk associated with increased physical distance between the host and susceptible as well as the level of physical activity of the host and /or the susceptible in enhancing transmission risk, is also examined .