Dozens more are being treated and there are fears the virus could spread.
About 1.8 million people are living in camps in the region after fleeing the armed group Boko Haram.
Al Jazeera's Catherine Soi reports from the city of Maiduguri.
Medecins Sans Frontieres says that the cholera outbreak is due to downpours in the last three days that caused floods at the affected camps. At least 1.8 million people are living ... Read more »