In an era where pandemics have become a reality, the discovery of a genetic defense against bird flu by scientists from the University of Glasgow is a significant development. Bird flus, since 1918, have triggered four pandemics, including the infamous 1918 flu pandemic, which claimed approximately 50 million lives. This pandemic, like the others, is believed to have originated from birds.
The scientists identified a segment of our genetic code, BTN3A3, which serves as a defense mechanism against bird flus. BTN3A3 becomes active in our nasal passages, throat, and lungs upon detection of an infection. This activation impedes the replication of bird flus, effectively thwarting their invasion. This defense mechanism has proven effective against most bird flus, preventing them from transitioning to humans.
However, all pandemic viruses to date have evolved to resist BTN3A3, allowing them to bypass this defense and infect humans. This was the case with the H7N9 bird flu, which developed heightened resistance to BTN3A3 in 2011 and 2012, leading to the first human cases in 2013.
Currently, the world's bird populations are grappling with the largest bird flu outbreak ever recorded, attributed to the H5N1 virus. Over half of the virus samples from birds and all seven human cases detected this year have demonstrated resistance to BTN3A3. This underscores that the ability to resist BTN3A3 is but one facet of the virus's threat to human health.
The research team, spearheaded by Prof Massimo Palmarini, director of the Centre for Virus Research in Glasgow, plans to routinely analyze the genetic code of flus circulating in birds. The objective is to identify and neutralize the dangerous strains before they can trigger a pandemic. Prof Palmarini is optimistic that this research will allow for accurate predictions of which viruses are likely to cross over to humans in the future.
The World Organisation for Animal Health (WOAH) has been dedicated to enhancing global animal health since 1924. They supervise various programs aimed at improving Veterinary and Aquatic Animal Health Services. Avian influenza, or 'bird flu', is a significant concern for WOAH due to its implications for the poultry industry, farmer’s livelihoods, international trade, and the health of wild birds.
Avian influenza is a highly infectious viral disease affecting both domestic and wild birds, and occasionally, mammalian species, including humans. The disease, caused by viruses divided into multiple subtypes such as H5N1, H5N3, H5N8, is spread through direct contact with secretions from infected birds or contaminated feed and water.
From 2005 to 2020, avian influenza resulted in the death or culling of 246 million poultry. During this period, humans have been sporadically infected with subtypes H5N1, H7N9, H5N6, with infrequent cases reported with subtypes H7N7 and H9N2.
WOAH has established international standards on avian influenza, providing a framework for effective surveillance and control measures. Through the OFFLU network, WOAH collaborates with partners to assess the risks of avian influenza viruses and offer guidance to the international community.
In conclusion, while bird flu remains a significant threat to both human and animal health, the discovery of our genetic defense and the relentless efforts of organizations like WOAH offer a ray of hope. As we continue to decode the mysteries of our genetic code and enhance our surveillance and control measures, we edge closer to a future where pandemics are relegated to history.
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