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H5 avian flu kills 13,000+ elephant seal pups with 97% mortality in some colonies.
H5 avian flu has killed over 13,000 elephant seal pups on Heard and McDonald Islands, marking the first arrival of the virus in an Australian territory. The outbreak has resulted in mortality rates reaching 97% in some colonies, creating an unprecedented wildlife catastrophe in the remote Southern Ocean region.
The virus likely arrived from the French Crozet Islands, highlighting how avian flu continues to spread across isolated ecosystems. The elephant seal pups, vulnerable during their nursing period, have been particularly susceptible to the infection. This outbreak represents a significant expansion of H5 avian flu's geographic range and demonstrates the virus's capacity to devastate marine mammal populations in previously unaffected areas.
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Virus expands reach into previously unaffected Southern Ocean region
The arrival of H5 avian flu at Heard and McDonald Islands marks a critical geographic milestone. The virus has now reached an Australian territory for the first time, expanding its footprint across isolated ocean ecosystems. Evidence suggests transmission from the French Crozet Islands, demonstrating the virus's ability to traverse vast oceanic distances and establish in new populations.
Elephant seal populations face unprecedented mortality crisis
The scale of marine mammal deaths is staggering, with over 13,000 pups killed and some colonies experiencing 97% mortality rates. Young seals in nursing colonies are proving particularly vulnerable to infection. This outbreak represents a catastrophic blow to elephant seal populations in one of the world's most remote and ecologically significant regions.