Mali is on alert over the deadly Ebola virus after three suspected cases were reported near the border with Guinea, where 86 people have died.
A BBC correspondent says there are tight controls on people entering the capital, Bamako, from the border area.
He says thermal-imaging cameras are screening passengers at the airport in case they have a fever.
The virus, which is spread by close contact and kills 25%- 90% of its victims, has already spread to Liberia.
Six people have died in Liberia, out of 12 suspected cases, according to the local health authorities.
Sierra Leone has also reported suspected cases, while Senegal has closed its normally busy border with Guinea.
Saudi Arabia suspended visas for Muslim pilgrims from Guinea and Liberia on Tuesday, in a sign of the growing unease about the outbreak
The tropical virus leads to haemorrhagic fever, causing muscle pain, weakness, vomiting, diarrhoea and, in severe cases, organ failure and unstoppable bleeding.