It's a year since the outbreak of Ebola in the Democratic Republic of Congo began.  More than 1,800 people have died, with the latest cases in Goma, a large city and important transport hub.  It's an area BBC Africa's Gaius Kowene knows well. 
 
Image:  Congolese health worker administers Ebola vaccine 
Credit:  REUTERS/Olivia Acland