Sweden has confirmed the H5 strain of bird flu in a duck on a game farm in the east of the country, the second possible case on a commercial farm in the European Union.
The European Commission in a statement said all birds on the farm, around 500 mallards and 150 pheasants, are to be killed in the next few hours.
Earlier, the Commission said Sweden had confirmed the lethal H5N1 strain of bird flu in the same duck.
It then corrected this statement, saying the deadly strain was "strongly suspected but not yet confirmed".