The mortuary in Damaturu, the capital of Yobe state, was overwhelmed as a single employee coped with the influx of dead bodies.

约贝州首府达马图鲁的太平间里，只有一个工作人员处理多具尸体，因而显得水泄不通。

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Cases originate from 16 Northern states, with states of the North East (Bauchi, Gombe and Yobe) being the most affected in the final week of the period.

病例起源于16个北方州，其中东北部几个州(包奇州、贡贝州和约比州)在流行期最后一周内受影响最严重。

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Last week, President Goodluck Jonathan declared a state of emergency in three north-eastern states - Borno, Adamawa, and Yobe - after a series of deadly attacks by militant groups.

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Yobe state police commissioner Sanusi Rufai said it was nevertheless too early to know who was behind the attack, which happened either late on Saturday or before dawn on Sunday.

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The BBC's Tomi Oladipo in Lagos says President Jonathan wants to use his trip to the states of Borno and Yobe to assert his authority in the face of the growth security threat.

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