 And indeed, a lot of this has been transmitted by the sex industry, as is typical in these regions. And lots of the sex workers move across the borders. And indeed, there have definitely been Rwandan cases that have been identified in the DRC, of Rwandan nationals who have been part of these presentations in the hospitals in DRC. I'm Trudy Lang, Professor of Global Health at the University of Oxford. You're listening to the BBC World Service. This is NewsHour.