The outbreak, which was declared on May 15, has been linked to the Bundibugyo virus, for which there is no approved vaccines or treatments. There are 797 patients in isolation or hospitalised, while a further 615 patients have recovered. The latest outbreak has killed more people at a quicker rate than any previous outbreak, including in 2014 to 2016 when 28,000 cases were reported, of which more than 11,000 people died. Officials say the withdrawal of aid groups including the World Health Organization, Africa CDC, Samaritan's Purse and Mercy Corps, has disrupted surveillance, contact tracing and supplies. Local health officials say security has since stabilised and are urging partners to return, with Africa CDC saying teams could redeploy as soon as next week.