Mali is working to prevent the Ebola virus from spreading to its capital city, Bamako, from across its border with Guinea. The deadly virus has already killed 86 people in Guinea, but the three suspected cases in Bamako are not yet confirmed. The local airport will use thermal-imaging cameras to detect fevers in passengers, so they can be quarantined and tested.Guinea has suffered the worst of the outbreak, but the disease has also spread to Liberia, where six people have died. Other countries are taking precautions: Senegal has sealed its border with Guinea, and Saudi Arabia cancelled the visas of pilgrims from Guinea and Liberia. This morning an Air France flight arriving in Paris from Guinea spent two hours in quarantine, until tests confirmed that a passenger suspected of being infected was healthy.Ebola is untreatable, highly contagious, and deadly. Let us hope it spreads no further than it already has.