Before the coronavirus pandemic, you might not have heard of contact tracers. But as Kathryn Dill reports, health departments across the country have long used them to track disease. – Whatfinger News' Choice Clips
Whatfinger News' Choice Clips

Before the coronavirus pandemic, you might not have heard of contact tracers. But as Kathryn Dill reports, health departments across the country have long used them to track disease.

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