Eleven military bases near major airports in the United States are setting up quarantine centers for possible coronavirus patients, the Department of Defense said. The Department of Health and Human Services asked the Pentagon for quarantine space in case beds fill up at other coronavirus centers around the country, according to a DOD statement. The Pentagon already agreed to house up to 1,000 people for quarantine after they returned to the United States from areas with the virus, the Associated Press reports. As of Friday, more than 31,400 people have been infected with the 2019 coronavirus worldwide, with most in mainland China, according to the AP. More than 630 people have died from the virus, almost all in China, the AP reports. "These are tertiary locations, and HHS already has primary and secondary locations identified that are not DOD facilities," the Pentagon said. Each base will be able to house up to 20 patients along with public health personnel and equipment. The agreement lasts until Feb. 22, the DOD said. "DOD personnel will not be in direct contact with the evacuees and will minimize contact with personnel supporting the evacuees," the Pentagon said. If anyone tests positive for the virus, public health officials with DHHS will move them to a civilian hospital, according to the statement.