How we trace the spread of coronavirus

Tracking who comes in close contact with people infected by the coronavirus is essential to understanding the spread of the disease — and getting regions on track to lift restrictions. POLITICO's Victoria Colliver explains how California plans to "build an army" of 10,000 contact tracers. Plus, Trump touts a new blueprint for increased testing that punts responsibility to states. And the WHO says the pandemic is far from over. Victoria Colliver is a health care reporter for POLITICO. Jeremy Siegel is a host for POLITICO Dispatch. Irene Noguchi is the executive producer of POLITICO audio. Jenny Ament is the senior producer of POLITICO audio. Read more: How California's contact tracing army could serve as model for nation's reopening.