The Centers for Disease Control and Prevention confirmed on Tuesday the first case of Ebola in the United States.
Tom Frieden, the CDC's director, said the patient had come from Liberia, and did not show any symptoms when he arrived in the U.S. on Sept. 20. During a news conference late Tuesday afternoon, Frieden said the situation is being closely monitored.
"It is certainly possible that someone who had contact with this individual ... could develop Ebola in the coming weeks," he said. "But there is no doubt in my mind that we will stop it here."
According to Frieden, public health officials will be working to identify all of those who may have had contact with the patient while he could have been infectious. Once identified, these individuals will be monitored for 21 days to see if they develop symptoms, he said.