Maine’s school health advisory system has been updated, as the state continues to see a low level of COVID-19 spread.

In the update put out Friday by the administration of Governor Janet Mills, all counties remain in the green category, which means in-person learning can proceed safely at schools in those counties. Androscoggin County was the only one not already green in the previous update, but the governor’s administration says the new case rate there has fallen by more than 25%, moving it to the green category.

Over the last 30 days, the rate of new cases for school staff and students has fallen to 39 per 10,000, compared to 60 per 10,000 in the general population.