Martin County has a fourth confirmed COVID-19 case, the only new known positive in south-central Minnesota. The Minnesota Department of Health’s 26 newly confirmed cases Friday bring the state’s total to 115. The total was 89 on Thursday. No other south-central Minnesota counties had new cases in the update. Blue Earth, Nicollet, and Waseca counties have a combined five existing cases. Health officials announced Martin County had a community transmission earlier this week. Hennepin, Ramsey and Olmsted counties have the most confirmed cases so far.