Bird flu is reported to have spread from Western Australia to South Australia, crossing state borders for the first time in the current outbreak. Multiple outlets report that the development follows the initial detection of a deadly H5 strain in Western Australia last week. The articles describe the spread as an “alarming” progression of the disease, indicating that affected birds or confirmed cases have been identified in South Australia after appearing in Western Australia. While the sources provided focus on the movement of the disease between states, they do not include additional details such as the number of cases, specific locations in South Australia, affected species, or whether any human infections have been detected. The reporting is consistent in framing the spread as a new stage in the outbreak chronology: first detection in Western Australia, followed by confirmation of spread to South Australia. Authorities are not further detailed in the provided excerpts, but the articles collectively emphasize cross-border transmission as the key new development.