The Centers for Disease Control and Prevention issued a travel advisory against nonessential travel to Guinea, Liberia and Sierra Leone on Thursday to curb the spread of the Ebola outbreak in West Africa that has claimed more than 700 lives, according to The Associated Press.
CDC Director Dr. Thomas Frieden said his agency will send an additional 50 disease experts to assist with efforts to contain the highly deadly virus, in what he called "the largest, most complex outbreak that we know of in history," the AP reported.
Sierra Leone has declared a state of emergency and called in troops to quarantine Ebola victims, joining neighboring Liberia in imposing controls, as the death toll from the outbreak of the virus in West Africa hit 729, according to the AP.
In a conference call with reporters, Frieden said the United States is joining the World Health Organization and others in escalating efforts to fight Ebola, the AP reported. He estimated that it could take at least three to six months to get the outbreak under control.
The advisory against nonessential travel to the three affected countries aims to prevent visitors from being exposed to Ebola in local health facilities should they need medical attention for other ailments, Frieden said, according to the AP.
Frieden also said airlines will continue to fly into the affected region, which will help maintain essential functions in the region, the AP reported.
Earlier on Thursday, the World Health Organization said it was launching a $100 million response plan to combat Ebola in West Africa, but is not recommending travel restrictions or border closures due, saying there would be a low risk to other passengers if an infected person flew, according to the AP.
CDC is also helping with screening and education efforts in West Africa to prevent sick travelers from getting on planes, the AP reported.
If they do, Frieden said the agency has protocols in place to protect against further spread of disease, including notification to CDC of ill passengers on a plane before arrival, investigation of ill travelers, and, if necessary, quarantine, according to the AP.
Ebola poses "little risk to the U.S. population," Frieden said on the call, the AP reported.