ETIDIOH - NEW

  Abstract The H5N1 high pathogenicity avian influenza virus (HPAIV) of clade 2.3.4.4b, which spreads globally via wild birds , has become a major public health concern because it can infect a variety of mammals , including humans . In 2024, infection of dairy cattle with H5N1 HPAIV clade 2.3.4.4b was confirmed in the United States , and subsequent human cases were reported. Although these viruses are highly pathogenic in animal models , human infections have generally been mild , revealing a striking discrepancy . Here, we characterized the cattle-derived human H5N1 isolate A/Texas/37/2024 (TX37-H5N1) using three-dimensional human respiratory organoids derived from induced pluripotent stem (iPS) cells. Despite efficient replication , TX37-H5N1 induced minimal interferon and inflammatory cytokine responses . Bulk and single-cell RNA sequencing revealed reduced STAT1-mediated transcriptional activity in TX37-H5N1-infected organoids compared to the historic H5N1 human isolate A/Vietn...

  Arch Virol YIN Y, Chen J, Chen S, Huang J, et al The SARS-CoV-2 N protein disrupts G3BP1 function and alters lipid metabolism in COVID-19 pathogenesis. Arch Virol. 2025;170:237. PubMed           Abstract available Biochem Soc Trans CALL MJ, Call ME, Wu X Insights from deep mutational scanning in the context of an emerging pathogen. Biochem Soc Trans. 2025;53:1169-1179. PubMed           Abstract available BMC Pediatr VASQUEZ-LOARTE T, Guerra GA, Saldarriaga EM, Torres-Gomez L, et al Healthcare access satisfaction before and during the COVID-19 pandemic among Peruvian children with down syndrome. BMC Pediatr. 2025;25:874. PubMed           Abstract available Drugs SYED YY Clesrovimab: First Approval. Drugs. 2025;85:1487-1492. PubMed           Abstract available J Exp Med BISSETT C, Yong L, Spencer AJ, Ma FNL, et al Heterologo...

  ABSTRACT An increase in the number of human cases of influenza A/H5N1 infection in the USA has raised concerns about the pandemic potential of the virus. Pre-existing population immunity is a key determinant for risk assessment and pandemic potential for any virus. Antibody responses against the bovine A/H5N1 hemagglutinin (HA) and neuraminidase (NA) proteins were measured among a population of influenza-vaccinated or influenza-infected individuals. Modest titers of bovine A/H5N1 HA-binding antibodies and low to undetectable neutralizing antibody titers were detected in a cohort of 73 individuals . Conversely, bovine A/H5N1 NA-binding and neuraminidase-inhibiting antibody titers were comparable to those against a human A/H1N1 NA at baseline . Seasonal influenza vaccination failed to significantly increase antibody titers against both HA and NA glycoproteins of bovine A/H5N1. Recent infection with human A/H1N1 but not A/H3N2 viruses induced significant increases in bovine A/H5N1-n...

  September 2025   The development of influenza candidate vaccine viruses (CVVs), coordinated by WHO, remains an essential component of the overall global strategy for influenza pandemic preparedness . Selection and development of CVVs are the first steps towards timely vaccine production and do not imply a recommendation for initiating manufacture . National authorities may consider the use of one or more of these CVVs for pilot lot vaccine production , clinical trials and other pandemic preparedness purposes based on their assessment of public health risk and need.  Zoonotic influenza viruses continue to be identified and evolve both antigenically and genetically, leading to the need for additional CVVs for pandemic preparedness purposes.  Changes in the antigenic and genetic characteristics of these viruses relative to existing CVVs and their potential risks to public health justify the need to develop new CVVs. This document summarizes the antigenic and genetic c...

  {By Subramanya CK - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=17954283 } Two Western Marsh Harrier wild birds in Burgas Region. Source: WOAH,  https://wahis.woah.org/#/in-review/6955 ____

  A fattening duck holding in Jász-Nagykun-Szolnok Region. Source: WOAH,  https://wahis.woah.org/#/in-review/6959 ____

A wild Mute Swan in Savinjska Region. Source: WOAH,  https://wahis.woah.org/#/in-review/6964 ____

{By  https://www.flickr.com/photos/sbern/ - https://www.flickr.com/photos/sbern/13471929904/ , CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=36391956 } A wild bird belonging to the Common Goldeneye Species. Source: WOAH,  https://wahis.woah.org/#/in-review/6956 ____

  Abstract Recently, highly pathogenic avian influenza (HPAI) A (H5N1) clade 2.3.4.4b viruses have caused mass mortality events in seabirds worldwide, raising concern for long-lived species with low reproductive rates. Using individual-level data from the 2022 mass mortality event in northwestern European Sandwich terns (Thalasseus sandvicensis), we show that older individuals were disproportionately more affected , while no sex bias was observed. This age-specific mortality likely removed the most experienced individuals from the population. Our findings highlight a previously underappreciated mechanism through which HPAI outbreaks may impair the resilience of long-lived avian populations . Competing Interest Statement The authors have declared no competing interest. Funder Information Declared German Federal Agency for Nature Conservation (BfN) Federal Ministry for the Environment, Climate Action, Nature Conservation and Nuclear Safety (BMUKN) Source: BioRxIV,  https://www.b...

  Key Points -- Question :  Have asymptomatic infections with highly pathogenic avian influenza A(H5N1) virus been reported in humans? -- Findings:  This scoping review of published reports through August 25, 2025, identified 10 reports of 18 cases of asymptomatic infection with A( H5N1 ) virus, including 2 cases with molecular and serologic confirmation and 16 cases with molecular confirmation alone. Symptom ascertainment methods varied among reported cases. -- Meaning:   Asymptomatic human avian influenza A(H5N1) virus infections have been infrequently reported , with most lacking serologic confirmation; prospective surveillance studies with serial respiratory and serum sampling and detailed symptom monitoring for persons with high-risk exposures could provide data to inform future public health responses. Abstract Importance    Since 1997, more than 1000 infections with highly pathogenic avian influenza A(H5N1) virus among humans have been reported globa...

  Abstract Highly pathogenic avian influenza virus H5N1 has been infecting dairy herds in the U.S. since its initial incursion into cows in early 2024 . Although national strategies have aimed to detect affected herds , the best way to surveil herds for the H5N1 virus has not been formally studied and we also do not understand herd-level patterns of infection . To understand infection patterns of H5N1 in dairy herds over time, we conducted early surveillance of non-affected farms in California in the Fall of 2024 in an observational study. Daily bulk tank milk (BTM) samples were submitted from each herd and tested for influenza A (IAV) via rRt-PCR. In a subset of herds, IAV testing of multiple excretion types from cattle of different classes and pen-level daily milk was also completed soon after BTM detection. Daily detections of IAV occurred in BTM for a minimum of 33 days , with some herds continuing to have detection beyond a 75-day window. BTM Ct nadirs were seen between 1-3 we...

  {England, Suffolk} Turkey fattening unit.  Source: WOAH,  https://wahis.woah.org/#/in-review/6954 ____

  Abstract Since 2020, high pathogenicity avian influenza virus (HPAIV) infections in wild birds have been frequently reported . Because HPAIV infection has occasionally caused outbreaks in captive rare birds , application of antiviral drugs for treatment purposes against them has been considered from the perspective of conservation medicine . In this study, the therapeutic efficacy of baloxavir marboxil (BXM) was evaluated using a duck model to help establish the post-infection treatment for rare birds . Sixteen four-week-old ducks were divided into four groups and intranasally inoculated with the HPAIV strain A/crow/Hokkaido/0103B065/2022 ( H5N1 ). BXM was orally administered once daily at doses of 12.5, 2.5, 0.5, and 0 mg/kg to each of the four groups from 2 to 6 days post-infection. Blood samples were collected at 2, 8, and 24 hours after the initial BXM administration to measure the plasma concentrations of its active form, baloxavir acid (BXA). All ducks were monitored until ...

A wild bird from Gruidae Spp. in Saarland Region. Source WOAH,  https://wahis.woah.org/#/in-review/6940 ____

  Abstract Avian influenza viruses (AIVs) are a global public health risk; human infection is typically associated with high mortality . While the relationship between several mammalian adaptive mutations and host factors have been described, it is unknown whether additional uncharacterised mutations lead to adaptation. Here, we combine phylogenetic analysis and complementary experimental methods to quantify the impact of novel mutations that emerge at the avian-mammal interface . We constructed phylogenetic trees of mammalian and avian influenza sequences for the polymerase (PA, PB1, PB2) and nucleoprotein (NP) segments and identified potential avian to mammal spillover events. We found >6500 mutations across the polymerase and NP, including known signatures of mammalian adaptation such as PB2 E627K and D701N which occurred independently in mammals 143 and 56 times respectively. We selected 95 mutations which were mostly undescribed and emerged independently multiple times in a...

  A protection zone (3km) and a surveillance zone (10 km) have been put in place around the infected farm and all other restrictions and necessary measures according to Regulation (EU) 2016/429 and (EU) 2020/687. {Tomelilla} Fattening turkeys. The turkeys were reported showing clinical signs of increased mortality 24 October and were euthanasia was finalized 26 October. A protection zone (3 km) and a surveillance zone (10 km) have been put in place around the infected farm and all other restrictions and necessary measures according to Regulation (EU) 2016/429 and EU DR 2020/687 are applied. Source: WOAH,  https://wahis.woah.org/#/in-review/6939 ____

  {Di Frank Liebig - Archiv Frank Liebig, CC BY-SA 3.0 de, https://commons.wikimedia.org/w/index.php?curid=56812600 } Wild birds belonging to the Gruidae Species in Berlin Region. Source: WOAH,  https://wahis.woah.org/#/in-review/6938 ____

  {By Charles J. Sharp - Own work, from Sharp Photography, sharpphotography.co.uk, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=66151818 } A wild Great Wild Pelican in Ha Zafon Region. Source: WOAH,  https://wahis.woah.org/#/in-review/6936 ____

Wild Mute Swans in Klaipedos, Vilniaus, Panevezio Regions. Source: WOAH,  https://wahis.woah.org/#/in-review/6923 ____

{Baden-Württemberg] Turkeys for fattening (1200), ducks for fattening (2400), geese for fattening (1200), broilers (6500), laying hens (4000). Source: WOAH,  https://wahis.woah.org/#/in-review/6927 ____