Poultry keepers with flocks of 50 or more birds are required to register their flock with the APHA. In the event of a disease outbreak neighbouring ‘at risk’ flocks can therefore be identified. These flocks would fall into a movement restriction or surveillance zone set up following the identification of an infected premise. All poultry keepers are encouraged to voluntarily register their flock, no matter how small, with the APHA to enable the tracing and monitoring of ‘at risk’ premises in the event of an outbreak.