"There are significant uncertainties to the true number of infected persons and geographic spread," the Geneva-based body warned
The World Health Organization declared an international health emergency on Sunday over an outbreak of an Ebola strain in the Democratic Republic of Congo that has killed more than 80 and for which there is no vaccine.
Fears of further spread grew when a laboratory on Sunday confirmed a case in the major eastern DRC city of Goma, which is controlled by the Rwanda-backed M23 militia.
A total of 88 deaths and 336 suspected cases of the highly contagious haemorrhagic fever have so far been reported, the Africa Centres for Disease Control and Prevention (CDC Africa) said in an update on Saturday.
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