As far as St Helena is concerned, the risk is primarily to our poultry flocks and other resident birds of note such as seabirds and the endemic wirebird, although the latter two categories should in theory be little affected.

Source: https://www.sainthelena.gov.sh/2023/press-releases/prohibition-on-imports-of-poultry-and-poultry-products-from-south-africa-due-to-avian-influenza-outbreak/