Health officials in Nevada are requiring all students at the state’s public universities and colleges to show proof of COVID-19 vaccinations in order to enroll in classes for the spring semester. The new policy, which was unanimously approved on Aug. 20 by the Nevada Board of Health at an emergency meeting, adds the requirement into an existing regulation (pdf) that mandates certain vaccines as a condition for enrollment. Gov. Steve Sisolak, a Democrat, signed the mandate shortly after the vote, saying in a statement that he was “grateful” for the decision. Under the emergency regulation, students have until Nov. 1 to either show proof of full vaccination or get religious or medical exemptions before enrolling in spring semester courses at any public university, state college, or community college. But those starting fall classes will not have to show proof they’ve been vaccinated for COVID-19. Those who don’t attend any class …