澳大利亚科研机构CSIRO发现H5N1禽流感病毒可能与本地病毒发生遗传物质交换，产生新毒株，对澳洲野生鸟类构成新的威胁。[1]根据CSIRO的检测，该国至少经历了6至7次独立的病毒传入事件，最初来源于距珀斯约4100公里的赫德岛。[1]目前H5N1已在南澳大利亚和维多利亚州的冠鸥和银鸥中发现，高度相似的基因组表明病毒正在澳大利亚本地鸟类间传播。[1]
由于H5N1为RNA病毒，由8个独立遗传片段组成，存在通过重组产生新毒株的可能。[1]CSIRO科学家Dr Frank Wong表示："当病毒进入新地区并从本地病毒获取基因片段时，可能为新基因型提供对该地区宿主物种更好的适应度。"[1]科学家们警告，这一情况可能对数量稀少的濒危物种造成灭绝级别的冲击。[1]
在防控手段方面，Dr Debbie Eagles指出现有疫苗需要两针注射，无法用于大规模野生鸟类保护，只能针对受威胁且可捕获的物种进行保护。[1]
Australian scientists have identified a concerning new risk in the country's battle against H5N1 bird flu: the virus could potentially exchange genetic material with local bird flu viruses to create novel strains.[1] CSIRO researchers have detected at least 6-7 independent introduction events originating from Heard Island, located approximately 4,100 kilometers from Perth.[1] The H5N1 virus, composed of eight separate genetic segments as an RNA virus, possesses the capacity to generate new variants through genetic reassortment.[1]
The pathogen has already established transmission among local bird species, with highly similar genomes identified in silver gulls and crested terns across South Australia and Victoria.[1] According to Dr. Frank Wong, "when the virus enters a new region and acquires gene segments from local viruses, it may provide novel genotypes with better fitness to host species in that region."[1] Scientists warn that such genetic recombination could pose an extinction-level impact on rare and endangered bird species in Australia.[1]
Current vaccination strategies offer limited protection for wild populations. Dr. Debbie Eagles explained that existing vaccines require two doses and cannot be deployed for large-scale wild bird protection, restricting their use to threatened species that can be captured.[1]