Bird flu in West Bengal spread to two more localities in Murshidabad district, health authorities here said Friday after over 52,500 birds were culled in the affected areas.

'Two more epicenters surfaced in the Khargram block,' a health ministry official said.

Earlier, the outbreak of the flu was reported in Hazrabati and Nagar villages in Murshidabad Jan 14 and in Faridpur village of Burwan block Jan 17.

'Containment measures have been initiated as per the contingency plan and culling of birds has started. So far 52,578 birds have been culled and 4,572 eggs have been destroyed,' the official added.

Officials also said that 301 poultry workers and veterinary surgeons involved in culling operations have been put on chemoprophylaxis.

The surveillance activities are going on.