Health officials in the Democratic Republic of Congo are responding to an Ebola outbreak caused by the rare Bundibugyo strain, for which there is currently no approved vaccine. The disease spreads through contact with infected bodily fluids and can cause fever, vomiting, diarrhoea and, in severe cases, organ failure. Containing the outbreak has proved especially difficult because many affected areas are experiencing conflict, displacement and poor access to healthcare. Some communities initially believed the illness was caused by witchcraft, delaying treatment and increasing transmission. Cases have been reported in four different areas, while neighbouring countries including Uganda and Rwanda have strengthened border screening and health precautions. International organisations are helping with treatment centres and public health campaigns. Despite concerns, experts say the wider global risk remains low at present. Update: WHO says it could take nine months to develop a vaccine. See