The recent emergence of Zaire ebolavirus in West Africa1 has come as a surprise in a region more commonly known for its endemic Lassa fever, another viral hemorrhagic fever caused by an Old World arenavirus. Yet the region has seen previous ebolavirus activity (see map).
In the mid-1990s, scientists discovered Côte d'Ivoire ebolavirus (now known as Taï Forest ebolavirus) as a cause of a single reported nonfatal case in a researcher...
