The outbreak of bird flu was first confirmed on January 15, and affected Malda, Cooch Behar, East Midnapore, South Dinajpur, South 24-Parganas, Nadia, Burdwan, Bankura, Purulia, Birbhum, Howrah, Hooghly and Murshidabad. On January 3, Bangladesh had confirmed the outbreak of avian influenza, which affected 29 of the 64 districts there.