The Democratic Republic of the Congo’s Ebola outbreak reached a sixth province on Thursday, Aug. 13, when Africa CDC director general Jean Kaseya said a man had died in Buta, the capital of Bas-Uélé, after traveling from Isiro in Haut-Uélé, the Guardian reports. Al Jazeera, drawing on AFP, AP and Reuters, carries the same account and quotes Kaseya: “If we do not stop this outbreak, it will last more than a year and will be the largest in the world.”

The World Health Organization logs 4,665 confirmed cases, including 2,184 deaths, in the DRC as of Aug. 12, spread over 54 health zones in Ituri, North Kivu, South Kivu, Haut-Uélé, Tshopo and Bas-Uélé. It says the Bas-Uélé case had traveled to Haut-Uélé and fell ill on Aug. 4, and that Ituri accounts for 85% of confirmed cases. Government figures differ slightly by outlet: Al Jazeera cites 2,128 deaths among 4,566 recorded cases, while the Guardian cites more than 2,100 deaths among more than 4,500 cases.

The Bundibugyo virus behind this outbreak has no approved vaccine or treatment, the Guardian and Al Jazeera report. WHO director general Tedros Adhanom Ghebreyesus said on Wednesday that two vaccines developed for the strain had entered testing in people for the first time and that, “at its current pace,” the outbreak looked on track to surpass the deadliest on record, which killed more than 11,000 people, Al Jazeera reports.

The Guardian adds that health workers at the Nizi treatment centre in Ituri went on strike over three months of unpaid wages, temporarily closing it, and that health authorities say 60% to 70% of new cases turn up outside monitored contacts.