Health officials in West Africa say 25 more people have died from Ebola since 3 July, taking the total number of deaths to 518.
The World Health Organization (WHO) said 50 new cases of the deadly disease had also been reported.
A WHO spokesman said health workers were struggling to contain the outbreak in Sierra Leone, Liberia and Guinea.
On Monday, a doctor in Ghana said preliminary tests on a US citizen showed he did not have the disease.
But further tests are now being carried out.
Please follow SGT Report on Twitter & help share the message.