Guinea

They - and four others - fell ill with diarrhoea, vomiting and bleeding after attending the burial of a nurse.

Newly developed vaccines will be acquired through the World Health Organization (WHO), officials said.

Between 2013 and 2016 more than 11,000 people died in the West Africa Ebola epidemic, which began in Guinea.

In response to that epidemic, which mainly affected Guinea and its neighbours Liberia and Sierra Leone, several vaccines were trialled, which have since been successfully used to fight outbreaks in the Democratic Republic of Congo.

The new policies, laid out in US State Department cables sent on Tuesday, are the latest example of President Donald Trump's effort to crack down on immigrants who are in the country illegally.

In each case, there are exceptions for those who apply for visas from outside their countries, as well as exceptions on humanitarian grounds or for travel "deemed in the interest of the United States".

The new rules, which go into effect on Wednesday, do not affect visas that have already been granted.

The news comes as health officials struggle to contain a resurgence of cases in both Sierra Leone and Guinea largely because of problems tracing patients.

The World Health Organization and its humanitarian partners indicated Wednesday that Phase Three of their Ebola response would continue into 2016. Those activities include stopping transmission of Ebola, indicating more cases are anticipated.

There is currently no licensed treatment or vaccine for Ebola, which has so far killed more than 11,000 people in West Africa since the world's biggest outbreak began in the forest region of Guinea last year.

"If proven effective, this is going to be a game-changer," said Dr. Margaret Chan, Director-General of the World Health Organization, which sponsored the study. "It will change the management of the current outbreak and future outbreaks."

The election in Guinea in October adds a new layer of worry for Guineans and health workers, with some residents saying that campaign events, in which people crowd together, shouldn't be held yet.

The deadly virus, which has killed over 11,100 people mostly in West Africa in its worst outbreak ever, has been stamped out in neighboring Liberia, but is hanging on stubbornly in Guinea, where the Ebola outbreak was first reported in March 2014. Impending presidential elections could make it even worse.