Some 24,000 Australian ducks were being destroyed after testing positive for a low pathogenic strain of the bird flu virus, an outbreak which has prompted poultry export bans in parts of Asia.
Bird flu, or avian influenza, is a viral infection spread from bird to bird. Currently, a particularly deadly strain of bird flu -- H5N1 -- continues to spread among poultry in Egypt and in certain parts of Asia.
Technically, H5N1 is a highly pathogenic avian influenza (HPAI) virus. It's deadly to most birds.