Most of the suspected cases and deaths are in Muna Garage, a camp for displaced people on the outskirts of Maiduguri, the capital of Borno — which is the epicenter of the jihadist Boko Haram insurgency.
The other victims come from neighboring districts.
Nigeria’s government and NGOs are now working to improve sanitation, including better water purification and installing extra latrines, in a bid to prevent new cases, the statement said.
The city of Maiduguri has doubled in size since the start of the conflict with Boko Haram some eight years ago, rising to some two million inhabitants due to influxes of displaced people from across Borno state.
The fighting has left some 20,000 people dead and displaced some 2.6 million in the country’s northeast, with many people now living in camps where they lack sufficient food and are at risk of diseases like malaria.