North Central Public Health District reports that between September 1 and September 8, schools in Wasco and Sherman counties reported 19 cases of COVID-19.  The district says school-based cases can be reported among students, staff or volunteers, and none were due to transmission in the school setting.  NCPHD school liaison Janelle Sandoz says the lack of cases from school settings tells her that mitigation efforts that have been in place at schools such as mask use, physical distancing, HEPA filters and good ventilation are working.  The school cases reported include four cases at Sherman County School, three each at Dufur School, Dry Hollow Elementary, and Colonel Wright Elementary, two each at The Dalles High School and The Dalles Middle School, and one each in the South Wasco County School District and Riverbend Community School.  Chenowith Elementary has not had any cases during this timeframe but has students out on quarantine related to cases outside the school.