GENEVA  The death toll in West Africa’s Ebola outbreak has risen to 660, with the number of cases surpassing 1,000, the World Health Organization said Friday. WHO spokesman Paul Garwood said that the extent of what is the deadliest outbreak of Ebola on record was still emerging. “This is a trend, an overall picture. It’s hard to get an exact picture on the scale of the situation at the moment,” he told reporters. The UN health agency said 28 news deaths were recorded between July 18 and July 20. Thirteen were in Sierra Leone, 11 in Liberia and four in Guinea, which had previously borne the brunt.

Forty-five new cases were recorded over the same period, in West Africa’s first-ever Ebola outbreak. That lifted the total number of laboratory-confirmed, probable or suspected cases of Ebola in the region to 1,093.