SALEM — From playgrounds to prisons, Oregon is facing ever-expanding steps to get ahead of the novel coronavirus that state officials estimate could infect 75,000 people in a matter of weeks.

The biggest jolt to the state came Thursday night as Gov. Kate Brown ordered every public school in Oregon closed effective Monday, March 16, sending home 583,000 students and their teachers and other school employees. Students aren’t expected to return to classrooms until Wednesday, April 1, and even then they will are likely to face days without assemblies, field trips or concerts.