Mass slaughter of domestic poultry birds, such as chickens and ducks, to contain the spread of bird flu is called culling.
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During culling operations, all domestic birds in an infected area, i.e., an area in which a case of bird flu has been detected, are slaughtered and their remains buried.
Though wild and other birds may also carry the bird flu, only domestic poultry birds are culled since they are present in close proximity with people, raising the chances of transmission of the virus to humans.
In India, culling is done in a radius one kilometre from the site of infection, which is called the ‘infected zone’. This means all domestic birds present in commercial farms, backyard farms or live bird markets in the infected zone are culled.