An outbreak has been reported from Budge Budge, a suburb of the capital, Calcutta, officials say.
A minister said that the situation was "alarming" Officials say more than 2.5 million birds would be culled.
The H5N1 strain of bird flu is regarded as highly pathogenic and can also cause disease and death in humans.
Health experts have warned that the outbreak could get out of control.
No cases of human infection have still been reported....
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