(Carolyn Kaster | AP Photo)Team Rubicon volunteer, EMT Hannah Tellier, from Boston, holds a COVID-19 test in the emergency room of the Kayenta Health Center on the Navajo reservation in Kayenta, Ariz., on April 23, 2020. The Navajo reservation has some of the highest rates of coronavirus in the country. Team Rubicon is helping with medical operations as cases of COVID-19 surge.