Australia officials have been overseeing the slaughter of 250,000 chickens on a large farm in Victoria, because of an outbreak of Newcastle disease. So far, reported the Office International des Epizooties, (zoonoses), health checks on surrounding farms within a 10 km radius had not revealed any signs that the disease has spread. Victorian authorities have started issuing permits for voluntary vaccination of other poultry flocks in the state as part of a risk-minimisation strategy.