SEOUL: South Korea was expanding a cull of chickens and ducks to try to contain a damaging bird flu outbreak. The H5N6 virus was first confirmed on November 18 at a farm in central South Korea and has since spread to farms around the country, with the total number of cases now standing at 28. The agriculture ministry said in a statement that it has culled more than 4.4 million birds and would slaughter another 2.7 million. Health authorities agreed to issue a so-called “standstill” order to restrict workers at poultry farms from moving around the country if the virus continues to spread, the ministry said in a statement.