Short communication: Lassa fever in Sierra Leone: UN peacekeepers are at risk. Monday 1 January 2001 ter Meulen J Lenz O Koivogui L Magassouba N Kaushik SK Lewis R Aldis W Tropical medicine & international health : TM & IH 2001 Jan ; 6(1); 83-4. doi: . Epub 2001 04 05