DAKAR, Senegal (AP) — The World Health Organization says it hopes to know as early as Tuesday whether the strain of Ebola in Congo's latest outbreak of the deadly virus is the one for which an experimental vaccine can be used.

The global health agency's emergencies director says 3,000 vaccine doses are still in Congo's capital after being positioned there for an earlier outbreak in the northwest that was declared over last week. Dr. Peter Salama says WHO can mobilize up to 300,000 more doses "at very short notice."

Officials say it is not yet clear whether the two Congo outbreaks are linked.

Authorities have warned that the new outbreak in northeastern Congo is especially challenging with multiple armed groups active in the region and with a well-traveled border with Uganda nearby.