Roundup: U.S. campuses become new front for combating COVID-19 pandemic as students return to school

WASHINGTON, Sept. 9 (Xinhua) -- More students are returning to campuses across the United States as new school year begins, adding risks for new COVID-19 infections and the country's control over the pandemic.

Sept. 8 marks the first day of school for more than 1.8 million American students, said a CNN report. Several schools have already had to temporarily shut down again after COVID-19 outbreaks this school year. Others, including some universities, have managed to keep their cases low after testing every student returning to school.