Federal Agriculture Minister Julie Collins said that the H5 strain of bird flu is transmitting locally among wild birds in South Australia [1].

The confirmation marks a critical shift in the regional outbreak, as the virus is no longer just arriving via migratory patterns but is now spreading between resident populations. This increases the risk of wider contamination across the state's avian wildlife and potential agricultural impacts.

According to Collins, local transmission has occurred specifically between a number of greater crested terns [1]. The virus has been detected across several locations, including a metropolitan beach, the state's South East region, and Kangaroo Island [2, 3].

Two native birds found dead previously tested positive for H5 [2]. While officials have not observed mass mortality, the number of suspected cases is rising. Reports on new suspected cases vary between seven [4] and 11 [5]. Specifically, some reports indicate seven suspected cases in the South East and four on Kangaroo Island [5].

In one instance, authorities identified five detections at a single site over a period of two days [4]. The spread is attributed to the movements of wild birds, which facilitate the transmission of the highly contagious pathogen.

"Local transmission has occurred," Collins said [1].

Australia's chief scientist said that the virus has started spreading locally among wild birds in the country [6]. Authorities expect the spread to continue as the virus moves through wild populations.

“"Local transmission has occurred," Collins said.”

The shift to local transmission indicates that the H5 virus has established a foothold in South Australia's ecosystem. While the lack of mass mortality is a positive sign, the presence of the virus in multiple geographic hubs—from metropolitan beaches to Kangaroo Island—suggests a fragmented but widespread distribution that makes containment difficult for wildlife officials.