The year-long Ebola outbreak in the Democratic Republic of the Congo is on the edge of spiralling out of control and the World Health Organization should declare it an international emergency, Rory Stewart, the UK’s international development secretary, has said.

Stewart is on a two-day visit to the DRC visiting emergency health centres and victims of the disease to assess the issues hampering efforts to bring the epidemic under permanent control. So far in the outbreak 2,400 people have contracted the disease and 1,606 have died, according to the WHO.