The Navajo Nation has returned to a higher level of COVID-19 precaution amid a renewed spike in cases in many U.S. states. Tribal health officials this week issued three emergency orders tightening safety measures in schools and limiting in-person …The Navajo Nation has returned to a higher level of COVID-19 precaution amid a renewed spike in cases in many U.S. states. Tribal health officials this week issued three emergency orders tightening safety measures in schools and limiting in-person …