Before revision:  The paper presents a suitable mathematical model of the process for feedback control analysisand uses well-known results from control theory to prove that suppression strategies can be effective if enacted very early , while mitigation strategies , including trying to achieve herd immunity, are likely to fail .
After revision:  The paper presents a suitable mathematical model of the process for feedback control analysisand uses well-known results from control theory to prove that suppression strategies can be effective if strong enough and enacted early on. It also shows how mitigation strategies can fail because of the combination of delay, unstable dynamics, and uncertainty in the feedback loop; approximate conditions based on the theory of limitation of linear control are given for feedback control to be feasible .