Local health officials say the COVID-19 outbreak in Union County reported as related to mass gatherings at a church is a warning about the importance of maintain physical distancing and wearing masks.  Hood River County Health Department Health Officer Dr. Christopher Van Tilburg said in a Facebook video Wednesday that as they try to move into Phase 2, they are concerned about virus transmission among residents gathering in groups.  He said he did not believe the primary source of the increase in COVID-19 cases in Hood River County was from tourists, seasonal workers, or workplace transmission.  North Central Public Health District Health Officer Dr. Mimi McDonell told the Wasco County Commission that research is showing people wearing masks does reduce the transmission of coronavirus. She said studies are indicating 50% of the population wearing masks can cut transmission by 80%.  The latest numbers update on Tuesday from the Oregon Health Authority showed both Hood River County and Wasco County reported just one new COVID-19 test apiece.  Hood River County is now at 83 confirmed and presumed COVID-19 cases and Wasco County is at 42.  In Washington, Klickitat County Tuesday afternoon added two more to move to 51 positive COVID-19 tests, while Skamania County remained at three.