Rare Ebola Strain With No Approved Vaccine Kills Dozens in Congo

A rare strain of Ebola with no approved vaccine or treatment may have circulated undetected for weeks in conflict-hit northeastern Democratic Republic of Congo before killing dozens of people.

Laboratory testing by the National Institute for Biomedical Research in Kinshasa confirmed the outbreak is caused by the Bundibugyo strain, the World Health Organization said Friday. The virus has caused only two previous known outbreaks, in Uganda in 2007 and eastern Congo in 2012.