Four more cases of coronavirus were confirmed in Montana Thursday. Three are in Yellowstone County and one in Roosevelt County. The new cases bring the total to what state officials now say is 15. According to Governor Steve Bullock the cases involved a Yellowstone County woman in her 20s and two Yellowstone men in their 20s plus a Roosevelt County woman in her 70s. The tests conducted by the Department of Public Health and Human Services Public Health Laboratory confirmed the four new cases.