The World Health Organization’s emergency committee is holding talks to discuss the Ebola epidemic.
The meeting in Geneva is examining screening measures at borders and considering whether stricter travel regulations should be put in place.
New rules in the US require travellers from the worst affected countries to arrive at one of five airports.
The known death toll is now 4,877 – a rise of 322 since the WHO’s last report five days ago.
Most of the victims died in Guinea, Liberia and Sierra Leone.
Meanwhile, first batches of an experimental vaccine against Ebola are due to arrive to Switzerland.
The vaccine, developed by Canada’s public health agency, combines fragments of Ebola with a non-fatal virus and could trigger the immune system to produce the necessary antibodies.
However, the BBC’s Imogen Foulkes in Geneva says a fully tested and approved vaccine is not expected to become available for months or possibly years.
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Credit: BBC