The resurgence of the coronavirus in the United States ignited fierce debate Monday about whether to reopen schools, as global health officials warned that the pandemic will intensify unless more countries adopt comprehensive plans to combat it. “If the basics aren’t followed, there is only one way this pandemic is going to go,”said the director of the World Health Organization, Tedros Adhanom Ghebreyesus. “It’s going to get worse and worse and worse.” Officials and health experts in hard-hit Miami pushed back against pressure, both from Gov. Ron DeSantis and President Donald Trump, to bring students back to classrooms next month. Officials in California’s two largest school districts, Los Angeles and San Diego, announced Monday that students will stick to online learning from home when school resumes next month, rather than return to classrooms. In New York, Gov. Andrew Cuomo said schools will be allowed to reopen in parts of the state where infection rates average 5% or less for two weeks. Students and teachers will be screened for illness, must wear face masks and keep 6 feet apart when possible.