That's according to the Africa CDC. As NPR's Jonathan Lambert reports, health officials are starting to say that basic public health measures are inadequate to control it. JONATHAN LAMBERT, BYLINE: Africa CDC Director Jean Kaseya is focused on one important measure of the outbreak response. Overall, this dynamic has stalled out the response, says Placide Mbala, director of clinical trials and science at Africa CDC. But on Thursday, Africa CDC officials said they'd be going ahead with clinical trials to find out.