The doorway to Jones Hall is shown at Utah State University in September, where about 300 students were being quarantined to their rooms as a precaution.

The doorway to Jones Hall is shown at Utah State University Wednesday, Sept. 2, 2020, in Logan, Utah. About 300 students quarantined to their rooms this week, but not because anyone got sick or tested positive. Instead, the warning bells came from the sewage. Colleges around the country are monitoring wastewater in hopes of stopping coronavirus outbreaks before they get out of hand. Utah State became at least the second school to quarantine hundreds of students after sewage tests detected the virus. (AP Photo/Rick Bowmer)