Before revision:  If the distancing rate is linearly proportional to infections, this model adds a single parameter to the original SIR , making it useful to illustrate the effects of social distancing enforced based on awareness of infections .
After revision:  If the distancing rate is linearly proportional to infections, this model adds a single parameter is added to the SIR model , making it useful to illustrate the effects of social distancing enforced based on awareness of infections .