Ebola crisis: BBC visits affected village in Guinea
3 August 2014 Last updated at 12:54 BST
The Ebola virus has claimed almost 700 lives in West Africa, amid warnings it is spreading faster than efforts to control it.
Health officials have said early diagnosis and treatment is key to survival, and are travelling to infected areas to teach people how to spot the symptoms of the deadly disease.
Tulip Mazumdar reports from the affected village of Gueckedou, Guinea, to meet those fighting an invisible killer.