New Delhi, July 13 -- The Ebola outbreak that has killed 702 people in the Democratic Republic of the Congo reached Tshopo province Saturday - whose capital, Kisangani, is one of the country's largest cities and its main river transport hub in the northeast. Health Minister Samuel Roger Kamba confirmed Friday that the virus had spread to Tshopo and Haut-Uele, a second new province bordering South Sudan, bringing the total under enhanced surveillance to five.

the outbreak's epicenter - pointing to human movement as the mechanism of spread rather than independent new chains of transmission. That distinction matters for containment. For now, it holds.

A senior World Health Organization official has warned that four out of five newly confir...