In this Aug. 18, 2021, file photo, visitors wear face coverings in Portland. Credit: Robert F. Bukaty / AP

Mainers should again wear masks regardless of their vaccination status in Androscoggin County because of the summer surge in COVID-19 cases.

There are now 54.49 cases per 100,000 people in Androscoggin County as of Wednesday, up from 46.18 the day before, according to a Bangor Daily News analysis.

Only Sagadahoc County (25.1) is exempt from the mask recommendation.

Those recommendations remain in force in Aroostook (143.17), Cumberland (56.95), Franklin (102.65), Hancock (98.21), Kennebec (60.51), Knox (67.89), Lincoln (72.18), Oxford (65.55), Penobscot (154.45), Piscataquis (303.84), Somerset (118.85), Waldo (113.31), Washington (79.67) and York (108.84) counties, data show.

The U.S. Centers for Disease Control and Prevention recommends people wear masks indoors regardless of vaccination status if there is substantial transmission of the virus in their community, defined as 50 or more cases per 100,000 people at a county level on a weekly basis.