With the deadly Ebola outbreak in Congo now an international emergency, neighbouring South Sudan and its war-weakened health system is a major concern, especially after one case was confirmed near its border.
Health experts say there is an urgent need to increase prevention efforts.
The World Health Organisation on Wednesday made the emergency declaration for the year-old outbreak, a rare move that usually leads to more global attention and aid.
More than 1,600 people have died in what has become the second-worst Ebola outbreak in history.
Health experts worry about what would happen if Ebola reaches South Sudan as the shattered nation tries to recover from a five-year civil war that killed nearly 400,000 people and displaced millions.
Many health facilities were badly damaged or destroyed, and unrest continues in parts of the country despite a fragile peace deal signed in September.
Last month a 41-year-old woman was discovered with Ebola in northeastern Congo, just 70 kilometers (43 miles) from South Sudan.
She had travelled 500 kilometers from Beni, the epicenter of the outbreak, despite having been exposed to the virus and warned not to travel.
South Sudan has sent a health team to strengthen surveillance at one of its busiest border posts, Kaya in Central Equatoria state, near where the woman's case was confirmed.
Hers was the closest confirmed case to South Sudan since this outbreak was declared.
"The risk of cases of Ebola coming across the border into South Sudan is very high," said Sudhir Bunga, South Sudan country director for the Centers for Disease Control and Prevention.
"A person who comes into contact with a confirmed case of Ebola in (Congo) could travel to South Sudan, or any neighbouring country, undetected during the 21-day incubation period and spread the disease once contagious."
But he expressed concern about the border: "There are forest areas between communities in South Sudan and the Congo and these people can't be screened from the other side. It's a big worry if those people sneak in and we have a case. It'll take us time to get in and control the issue."
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