testing and tracing rely heavily on each other to be truly effective. Testing on its own does little to help control a virus. It tells us only who already has the virus, not where it has spread. Similarly, tracing alone does not help much if we cannot identify asymptomatic individuals. Tracing is also compromised if it’s not feasible to quarantine those individuals whom we find, either because they are unwilling or unable to self-isolate at home or because we lack places where they can stay—for example, if they are homeless or if they live in a crowded environment. It’s only when you can test,
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