 We illustrate this qualitative difference between the two strategies and identify the factors that explain the effectiveness of contact tracing in sharply reversing the upward trend of the original epidemic curve, causing its bending.
<clarity>  We illustrate this qualitative difference between the two strategies and identify the factors that explain the effectiveness of contact tracing in sharply reversing the upward trend of the original epidemic curve, causing its bending.
 We illustrate this qualitative difference between the two strategies and identify the factors that explain the effectiveness of contact tracing , namely its capacity to reverse the increasing tendency of the epidemic curve, causing its bending.