ETIDIOH - NEW

Abstract H5N1 influenza outbreaks have been reported on more than 1,070 dairy farms across 17 states in the US . Damage to the mammary gland and high levels of virus in milk were common features of the infected cattle, but it is unclear how the virus initially invades the mammary glands, and no control strategy is currently available. Here, we found that cattle oral tissues support H5N1 virus binding and replication , and virus replicating in the mouth of cattle transmitted to the mammary glands of dairy cattle during sucking . We also found that an H5 inactivated vaccine or a hemagglutinin-based DNA vaccine induced sterilizing immunity in cows against challenges with different H5N1 viruses. Our study provides insights into H5N1 virus transmission and control in cattle. Source: National Science Review,  https://academic.oup.com/nsr/advance-article/doi/10.1093/nsr/nwaf262/8180392?searchresult=1 ____

  Public Domain. Source: WikiArt,  https://www.wikiart.org/en/joshua-reynolds/three-ladies-adorning-a-term-of-hymen-1773 ____

Abstract Highly pathogenic avian influenza of the H5N1 subtype has shown recent unprecedented expansion in its geographic and host range , increasing the pandemic threat . The younger age of H5N1 versus H7N9 avian influenza in humans has previously been attributed to imprinted pre-immunity to hemagglutinin stalk (HA2) epitopes shared with group 1 ( H1N1, H2N2 ) versus group 2 ( H3N2 ) influenza A subtypes predominating in the human population before versus after 1968, respectively. Here we review the complex immuno-epidemiological interactions underpinning influenza risk assessment and extend the imprinting hypothesis to include a potential role for cross-protective neuraminidase (NA) imprinting . We compare H5N1 distributions and case fatality ratios by age and birth cohort (as proxy for HA2 and/or NA imprinting epoch) not only to H7N9 but also H5N6 and H9N2 avian influenza, representing more varied conditions of zoonotic influenza relatedness to human subtypes of the past century. We...