New bird flu cases at Vietnamese duck farms

Tests have confirmed the H5N1 virus infected waterfowl in three northern provinces of Son La, Quang Ninh, Nam Dinh and the southern Mekong delta city of Can Tho from May 16 to May 19, the Agriculture Ministry's Animal Health Department said. 

The dead ducks were found on seven farms which were raising a combined 5,850 ducks. None of them had been vaccinated against bird flu, the department said in a daily report on the disease.