Jan 15, 2021 / 05:02 PM EST INDIANAPOLIS (WISH) — New research from the Centers for Disease Control finds that when millions of students went back to class recently, communities did not see a major spike in COVID-19 cases. It led the agency to recommend: “K-12 schools be the last settings to close after all other mitigation measures have been employed and the first to reopen when they can do so safely.” The researchers looked at statistics from the nearly two-thirds of U.S. schools going back to class. They found 3 million cases in people under age 24, and discovered most of those cases were in people age 18 to 24.