This is the first case of Influenza A H1 in an Australian pig herd - but not in the world - and at this stage we believe it was most likely introduced by people working with the animals.
The affected 280-sow piggery which is currently housing about 2,000 pigs has been placed in quarantine and strict biosecurity measures are in place to ensure the virus does not spread.
http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0007/291832/Influenza-A-detected-at-NSW-piggery.pdf