H5N1禽流感病毒首次在澳大利亚维多利亚州出现，当地已检测到23例确诊病例，全部位于州西南部波特兰地区[1]。这种高度致命且具强传染性的病毒能够感染多种野生鸟类、哺乳动物和家禽[1]，对当地养鸡场和野生动物构成重大风险。
维州农业部门已启动应急响应，包括实施生物安全措施和栖息地保护策略[1]。根据防控规定，一旦养鸡场确诊禽流感，场内全部禽类需被安乐死[1]。位于该地区的Zac Jeffries农场有5000只鸡面临此风险[1]。维州在2020年以来已经历三次H7禽流感爆发，导致超过100万只鸡被扑杀[1]。
当地官员对病毒传播的可能性表示担忧。野生动物专家预计鸭子可能成为"超级传播者"，单日可飞行数百公里[1]。波特兰地区拥有澳大利亚唯一的本土鲣鸥群落，该鸟类的繁殖季节将于下月开始，因此面临严重风险[1]。许多维州本地物种此前从未接触过该病毒，使情况更加复杂[1]。
针对防控挑战，威尔德生物健康澳大利亚紧急项目经理Simone Vitali博士指出，疫苗接种仅对部分物种可行，相关试点研究正在进行中[1]。
H5N1 avian influenza has been detected for the first time in Victoria, Australia, with 23 confirmed cases identified in the southwestern Portland region [1]. The highly contagious and lethal virus poses a significant threat to local poultry operations and native wildlife species that have never encountered the pathogen before [1].
The outbreak carries particular risks for chicken farms in the affected area. Facilities found to harbor the virus must conduct mass culling of all birds, with operations like the Zac Jeffries farm facing potential loss of 5,000 chickens [1]. This latest incursion mirrors previous challenges in Victoria, where three H7 avian flu outbreaks since 2020 resulted in the culling of over one million birds [1].
Wildlife authorities are particularly concerned about the role migratory waterfowl may play in spreading the disease. Officials anticipate ducks could act as "super-spreaders," capable of traveling hundreds of kilometers in a single day [1]. One location hosts Australia's only native population of a particular seabird species, with breeding season beginning next month, presenting a serious risk [1]. Vaccination offers limited solutions, according to Dr. Simone Vitali, emergency program manager at Wildfire Health Australia, who noted that immunization is viable only for certain species and pilot studies are currently underway [1]. Authorities have implemented biosecurity measures and habitat protection strategies to mitigate the risk of large-scale transmission [1].