Before revision:  Experimental results of disease transmission confirms that contact tracing requires both significant visibility (at least 60  %DIF < ) into the proximity graph and the ability to place half of the population under isolation, in order to stop the disease.
After revision:  Experimental results of disease spreading shows that that at low visibility rates contact tracing slows disease spreading. However to stop disease spreading, contact tracing requires both significant visibility (at least 60  %DIF < ) into the proximity graph and the ability to place half of the population under isolation, in order to stop the disease.