Ebola is on the rise in Sierra Leone's capital of Freetown. Just this week, 234 new confirmed infections were reported, and every day hundreds of residents call the emergency line to report more possible cases in their neighborhoods.
To deal with the surge, the nation sends health surveillance teams into the community to investigate the alerts, visiting up to five homes a day to check on residents.
The junior member of one team is Osman Sow, a young man with a wisp of a beard and a serious manner.