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Illustration of Vibrio cholerae, a gram-negative, rod-shaped bacterium responsible for cholera. This pathogen produces a toxin that causes gastrointestinal symptoms. [AFP]

Police in Nigeria said they were enforcing sanitation measures in the northeastern state of Borno on Saturday, where a cholera outbreak has killed dozens.

Some 39 people have died from the waterborne disease across Borno in recent weeks, with at least 4,204 infected, according to the latest figures from local health authorities.

The outbreak is concentrated in Borno capital Maiduguri and the surrounding Jere district, health authorities reported in an update Tuesday.