Correction – 10th April 2013 – “The [H7N9] virus killed thousands of pigs..” Incorrect. Reports are conflicting. But the World Health Organisation currently states there is no evidence that the pigs were killed by the influenza virus. (source 1).
Update – 22nd April 2013 – The Star reports that only 30 of the 16,000 pigs were tested for H7N9. The cause of their death remains an open question.