BELFAST, Maine — Nathaniel Baer’s daughter is in the fifth grade at Captain Albert W. Stevens School in Belfast, where she loves going to class and seeing her friends. So it came as a blow when the Maine Department of Education changed Waldo County’s school safety rating to “yellow” on Friday, signaling that it’s not safe for schools in the county of fewer than 40,000 residents to open in person full time. Waldo is currently the only county the state has designated “yellow,” meaning it’s only safe for schools there to use a hybrid model in which students learn in person only part of the week. The downgrade stems from the outbreak connected to the Brooks Pentecostal Church.