India worst bird flu outbreak spreads

India's worst outbreak of bird flu spread as health authorities battled on Friday to stop it reaching the densely populated city of Kolkata amid heavy rain that hampered culling efforts.

Authorities reported the disease had affected two more districts, bringing the number hit by avian flu to 12 out of West Bengal state's total of 19.

Howra, one of the new districts reporting the disease, neighbours Kolkata. The other district was Purulia on the border with the eastern state of Bihar.

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