Authorities are monitoring at Duke University a patient who traveled from Liberia and developed a fever, according to the North Carolina Department of Health and Human Services. Officials said the patient, whose age and gender have not been released, arrived Friday from Liberia, landing at Newark’s airport, one of five in the U.S. that screen travelers from Liberia, Guinea, and Sierra Leone for fever and other symptoms linked to Ebola. The patient had no symptoms on arrival and had no known exposure to the virus while in Liberia, officials said. The patient took a bus from New Jersey to Durham County, self-monitored, and called the Centers for Disease Control and Prevention at the onset of the fever. Results of tests on the patient were expected Monday morning.