Mali on Saturday confirmed a new case of Ebola and said two more suspected patients are being tested, raising concern about a further spread of the disease which has already killed at least five people in the country.

On Mali’s dusty border with Ebola-stricken Guinea, travelers have a new stop: Inside a white tent, masked medical workers zap incomers with infrared thermometer guns and instruct them to wash their hands in chlorinated water.

It all started with a sick nurse, whose positive test for Ebola came only after her death. In a busy clinic that treats Mali’s elite as well as wounded U.N. peacekeepers, what patient transmitted the virus?

Liberian President Ellen Johnson Sirleaf said enough progress has been made in the fight against Ebola to lift emergency measures.