U.S. Centers for Disease Control and Prevention U.S. Centers for Disease Control and Prevention Lassa fever U.S. Centers for Disease Control and Prevention U.S. Centers for Disease Control and Prevention U.S. Centers for Disease Control and Prevention U.S. Centers for Disease Control and Prevention 300,000 infections per year in Africa U.S. Centers for Disease Control and Prevention U.S. Centers for Disease Control and Prevention 300,000 infections per year in Africa 300,000 infections per year in Africa U.S. Centers for Disease Control and Prevention U.S. Centers for Disease Control and Prevention