Washington says it will launch contact tracing teams to map coronavirus exposure. Here, public health nurse Jennifer Morgan, right, checks-in via phone with a patient self-quarantined at home in February. University of Washington epidemiology student Erika Feutz observes in Seattle.

Washington says it will launch contact tracing teams to map coronavirus exposure. Here, public health nurse Jennifer Morgan, right, checks-in via phone with a patient self-quarantined at home in February. University of Washington epidemiology student Erika Feutz observes in Seattle.