The American doctor who contracted Ebola in the Democratic Republic of Congo has returned to the United States.
The outbreak has been declared a public health emergency requiring international response.
Dr. Stafford was exposed while treating patients in the democratic republic of Congo, where an Ebola outbreak has killed nearly 120 people.
The secretary's comments come after the CDC said a "small number of Americans" are directly affected by the current Ebola outbreak in the DRC.
The CDC said Monday it is preparing to restrict entry for travelers arriving from parts of central Africa where an Ebola outbreak has been declared.
The CDC said in a statement on Sunday that a "small number of Americans" are directly affected by an Ebola outbreak occurring in the Democratic Republic of Congo.