This is not wrong, but maybe fairly obvious, and why the unwinding strategies require contract tracing to test for pre-symptomatic infection. The article asser

This is not wrong, but maybe fairly obvious, and why the unwinding strategies require contract tracing to test for pre-symptomatic infection. The article asserts that additional testing capacity is required for prophylactic testing, but that statement is both true and false. We will probably need ~20x testing capacity for just contact tracing to get R0<1. At that point, prophylactic testing (say every 3-5 days) of health/elderly care workers would be a marginal increase.