Nigeria H5N1 bird flu spreads to four more states, total 11

An outbreak of H5N1 bird flu in Nigerian poultry farms has spread to four more states, raising the total of affected areas to 11, the agricultural and rural development minister said on Thursday.

Africa's most populous country and biggest economy was the first country on the continent to detect bird flu, in 2006 when chicken farms were found to have the H5N1 strain. In 2007, Nigeria recorded its first human death from the disease.

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