The head of the World Health Organization on Wednesday urged authorities to step up the Ebola response and better protect frontline health workers, during a visit to the DR Congo where a deadly outbreak is spreading fast. The Democratic Republic of Congo declared its 17th Ebola outbreak on May 15. The new funding brings direct US financial assistance in response to the outbreak to more than $500 million, the State Department said, underlining that the United States remained "the largest financial contributor to the Ebola response". And Singapore-based Hilleman Laboratories is working on bringing a third potential Bundibugyo jab to human trials. The WHO sees it as the "most promising" because it uses the same rVSV platform as the only officially licenced Ebola vaccine Ervebo, which targets a different strain called Zaire.