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H5N1 avian flu confirmed in mammals in the sub-Antarctic for the first time - elephant & fur seals - January 11, 2024

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  • H5N1 avian flu confirmed in mammals in the sub-Antarctic for the first time - elephant & fur seals - January 11, 2024

    Source: https://www.gov.uk/government/news/b...the-first-time


    Press release
    Bird flu found in mammals in the sub-Antarctic for the first time

    Results confirm High Pathogenicity Avian Influenza (HPAI) has been found in elephant and fur seals on the sub-Antarctic island of South Georgia.

    From: Animal and Plant Health Agency
    Published
    11 January 2024

    The presence of High Pathogenicity Avian Influenza (HPAI) has today (Thursday 11 January) been confirmed for the first time in mammals in the sub-Antarctic. The disease was detected in elephant and fur seals on the island of South Georgia by experts from the UK’s world-leading Animal Plant Health Agency (APHA).

    Working alongside the Government of South Georgia and South Sandwich Islands (GSGSSI) and the British Antarctic survey (BAS), APHA has been at the forefront of testing for bird flu in mammals in this sub-Antarctic region since it was first suspected last year.

    South Georgia is a UK Overseas Territory situated in the Southern Atlantic Ocean, approximately 1,000km south-east of the Falkland Islands, and is accessible only by ship. It has some of the most closely monitored seabird colonies in the world, equipping scientists and conservationists with indicators of change for species.

    HPAI was first suspected on Bird Island off the northwest coast of South Georgia in October 2023 after the deaths of several brown skua. Sequence analysis from infected birds demonstrates that the virus has most likely been introduced through migratory bird movement from South America.

    Leading APHA scientist Dr Marco Falchieri of the Influenza and Avian Virology team spent three weeks in the sub Antarctic region visiting the affected islands onboard Royal Navy vessel HMS Forth and collected samples from dead mammals, including elephant seals, and birds.

    Following testing and sequencing at APHA’s laboratory in Weybridge, the samples have tested positive for HPAI H5N1 in elephant seals, fur seals, brown skuas, kelp gulls and Antarctic terns.

    Samples were also collected from albatross and giant petrel colonies on Bird Island but tested negative. There have been no reports of above average mortality in any penguin species to date.

    The available genomic surveillance data continues to suggest no widespread mammalian adaptation of the virus. There remains no increased risk to human health - the risk of human infection with H5N1 remains very low.​...



  • #2
    Please see:

    First Avian Influenza Cases Confirmed in Antarctic Region - wild birds - October 23, 2023

    FluTrackers South America Avian Flu forum by country - https://flutrackers.com/forum/forum/...n1-tracking-ab

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    • #3
      Worst avian flu crisis ever recorded spreads across Antarctica

      A Spanish expedition finds the potentially lethal virus ‘in all animal species detected at each site’

      ​FEB 14, 2025 - 09:29 EST​
      Gabriel de Castilla Antarctic Base

      The highly pathogenic avian influenza virus, which has caused the death of hundreds of millions of birds in the last five years around the world, is spreading across Antarctica, a pristine paradise for wildlife. An expedition led by Spanish virologist Antonio Alcamí has confirmed the presence of the virus “in all animal species detected at each site” on six islands in the north of the Antarctic Peninsula, according to a report sent to the Spanish Polar Committee and international authorities. The good news is that penguins appear to be more resistant than feared, but the pathogen is wreaking havoc on other species. On Joinville Island, scientists have observed that the virus has attacked crabeater seals “with particular virulence.”​ ...

      Alcamí explains to this newspaper, with two journalists deployed to the Spanish Gabriel de Castilla Antarctic Base, operated by the Spanish army. The researchers have detected the pathogen even in air samplestaken in the penguin colonies, warns the report, sent to the Scientific Committee for Research in Antarctica, an international body.​ ...

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      • #4
        Translation Google

        Bird flu has decimated elephant seal populations, a study shows

        Paris (AFP) – Elephant seals, the world's largest seal species, have been devastated by avian flu, scientists warned Thursday, based on a population collapse on an island near Antarctica.

        Published on:13/11/2025 - 18:15
        Modified on:13/11/2025 - 18:13

        Since the arrival of avian flu in 2023 in South Georgia, the number of breeding females present on the beaches has fallen by 47%, or about 53,000 fewer elephant seals, according to this study published in the journal Communications Biology.

        This isolated island, located in the Atlantic Ocean off the Antarctic coast, serves as an anchor point for the vast majority of southern elephant seals. According to the last count carried out in 1995, it serves as a refuge for just over half of them.

        Bird flu arrived on this island in 2023, after spreading around the world like never before, killing hundreds of millions of birds and affecting many mammal species as well as several human beings.

        Now, for elephant seals, the situation there is "heartbreaking," Connor Bamford, lead author of the study and member of the UK's National Polar Research Institute, told AFP.

        "There are thousands of them spitting and coughing," says Bamford, highlighting the seals' tendency to have "runny noses."

        Researchers believe these mammals transmit the virus to each other through water droplets, according to Mr. Bamford. While elephants spend most of their time in the water, they breed in densely populated areas on wide sandy beaches.

        Many newborns have also died on the beaches after their mothers, affected by avian flu, abandoned them.

        Earlier this year, a study on the Valdés Peninsula, one of Argentina's coasts conducive to births, had already determined that 97% of newborns had died either from abandonment or after contracting avian flu.

        Even more breeding females – about two-thirds – have disappeared from this peninsula, compared to South Georgia.

        "If the population of South Georgia Island responds similarly to the patterns observed in the Valdés Peninsula, the future is bleak," the study authors emphasize.

        Connor Bamford, however, does not believe that elephant seals are "close to extinction".

        The population living on South Georgia Island is much larger - hundreds of thousands - than those on the Argentine coast, giving hope that it is more resilient.

        "But the impacts on this population will be felt for many years," he adds.

        Les éléphants de mer, principale espèce de phoques dans le monde, ont été dévastés par la grippe aviaire, alertent jeudi des scientifiques, sur la base d'un effondrement de la population sur une île…


        ----------------------------------------------------------------
        See also:Highly Pathogenic Avian Influenza Viruses (HPAIV) Associated with Major Southern Elephant Seal Decline at South Georgia
        Communications Biology volume 8, Article number: 1493 (2025)

        Download PDF

        Abstract

        The emergence of highly pathogenic avian influenza viruses (HPAIV) has caused widespread mortality wildlife globally. In 2023, mass mortalities of southern elephant seals Mirounga leonina were observed in South America, and the virus subsequently reached the sub-Antarctic, affecting multiple species. The remoteness of these islands has limited assessment of its true impact. Here we present evidence of HPAIV’s effect on the number of breeding females at the world’s largest southern elephant seal population at South Georgia. Following the virus’ arrival in 2023, we recorded a 47% (SD = 14.2%) decline in the number of breeding females at the three largest breeding colony beaches in 2024 compared to 2022. The apparent loss of nearly half the breeding female population has serious implications for recruitment and future stability of the population. These findings highlight the urgent need for continued, intensive monitoring to track the long-term effects on this species.​​
        ...


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