After months of planning and billions in spending, will colleges’ virus prevention efforts get trashed by a few student parties?

University officials planned for months for the resumption of fall classes amid the pandemic, with experts advising them on the rapidly evolving understanding of the novel coronavirus. They spent tens of billions of dollars creating massive testing programs, clearing out dorm space for quarantines, sticking reminder dots six feet apart on sidewalks, overhauling ventilation systems and crafting public health campaigns centered around feisty mask-wearing mascots. But as cases of the coronavirus have popped up on campuses, forcing some schools to empty their dorms or switch to virtual classes, one factor cannot be ignored: Students like to party. And good luck reining that in.