ESCANABA — Both local and state data Friday showed Delta County with 25 new COVID-19 positives in the past three days, as coronavirus activity rose significantly this week throughout the Upper Peninsula.

Public Health of Delta and Menominee Counties on Thursday had reported Delta County’s first confirmed case of the highly contagious delta variant. The PHDM added that the delta variant now has been found in Dickinson, Marquette, Houghton and Gogebic counties.

On its website Friday, the PHDM also listed 10 new confirmed positives in Menominee County, along with nine probable cases. Delta County has four more probable positives.

The PHDM website Friday had Delta County at 3,416 confirmed positives, 731 probable cases and 94 deaths. Menominee County has had 1,828 confirmed positives, 350 probable and 40 deaths. The deaths included confirmed and probable.

Given how easily the delta variant is transmitted, the PHDM on Thursday endorsed recent Centers for Disease Control and Prevention guidelines that recommend wearing masks indoors in public, even for fully vaccinated individuals, and having K-12 schools resume wearing masks in class to reduce transmission.

At the state level, the Michigan Department of Health and Human Services coronavirus website showed 81 new confirmed positives in the U.P. since Tuesday: the 25 in Delta County, 13 in Gogebic County, 11 in Houghton County, eight in Menominee County, seven in Chippewa County, six in Marquette County, four in Baraga County, three in Luce County, two in Dickinson County and one each in Iron and Mackinac counties; Ontonagon County’s count was reduced by one.

Using only the MDHHS figures, the Upper Peninsula as of Friday has had 20,399 confirmed COVID-19 cases and 446 deaths.

Across the U.P., the MDHHS data Friday had Keweenaw County at 142 confirmed cases and 32 probable, and one confirmed death and one probable death; Luce County, 231 confirmed cases and 256 probable, four confirmed deaths and one probable death; Alger County, 323 confirmed, 196 probable and three deaths, four probable; Schoolcraft County, 356 confirmed cases and 85 probable, four deaths and one probable; Ontonagon County, 425 confirmed, 62 probable and 21 deaths, one probable; Mackinac County, 465 confirmed cases and 256 probable, three deaths; Baraga County, 701 confirmed cases, 130 probable and 39 deaths; Iron County, 1,006 confirmed cases and 73 probable, 43 deaths and 10 probable; Gogebic County, 1,101 confirmed cases and 369 probable, 24 deaths and 29 probable; Chippewa County, 1,135 confirmed cases and 1,436 probable, and 29 deaths, six probable; Menominee County, 1,823 confirmed cases, 344 probable and 41 deaths, two probable; Dickinson County, 2,440 confirmed cases and 351 probable, 59 deaths and 15 probable; Houghton County, 2,559 confirmed cases, 609 probable, 35 deaths and eight probable; Delta County, 3,409 confirmed cases and 725 probable, 76 deaths and 19 probable; and Marquette County, 4,283 confirmed cases, 840 probable and 64 deaths, one probable. State figures are updated regularly but can lag behind local reports or have other discrepancies.

The MDHHS on Friday had 3,962 confirmed new coronavirus positives in Michigan, or an average of 1,321 per day for the three days, for a total to date of 910,500. The state Friday added three deaths attributed to the virus — all having occurred earlier but recently verified through a vital records review — to reach 19,950.

The state in July began posting new COVID data only twice a week, on Tuesdays and Fridays. Staring next week, it will provide an update on Wednesdays as well.