A highly pathogenic strain of bird flu, H5N1, has been detected in Australia for the first time, although there is no evidence of the disease spreading. At the same time a more common strain of the disease, H7N3, has been detected in two chicken egg farms in Victoria. Matilda Boseley speaks to Guardian Australia’s rural and regional editor Calla Wahlquist about why the poultry industry is worried – but everyday Australians don’t need to panic just yet