There are now more than 600 suspected cases and 139 suspected deaths from the virus, mostly in Congo, the head of the World Health Organization said at a news conference Wednesday.

More than 300 suspected cases and 88 suspected deaths have so far been reported, primarily in Congo but also in neighboring Uganda.

Health officials are racing to contain a rapidly expanding outbreak of Ebola in Africa. At least 116 suspected deaths and more than 300 other cases have been reported in the…