ETIDIOH - NEW

Abstract Highly pathogenic avian influenza A (H5N1) (H5N1 hereafter) is an emerging pathogen in mammals . The recent recognition of H5N1 in dairy cattle increases opportunities for human exposure and infection and may accelerate a trajectory toward sustained human-to-human transmission . Furthermore, the presence of virus at high concentration in unpasteurized milk raises new risks for humans , especially infants and children . Milk has been identified as a vehicle for viral transmission in and between mammalian species, including humans. Sialic acids (SAs) found on cell surfaces are important mediators of species susceptibility to specific influenza strains and play an important role in viral tropism . New data demonstrate that SA receptors with α2,3 linkages capable of binding avian influenza strains are present in human mammary tissue . The presence of SA receptors that can bind avian influenza and a comparative analysis of viral transmission risk of raw and pasteurized milk in seve...

  Highlights •  Global mobility, climate pressures, and ecological change drive emerging infections. •  Highly pathogenic influenza strains, including H5N1, pose ongoing spillover risks and pandemic potential. •  SARS, MERS, and COVID-19 illustrate the pandemic potential of novel coronaviruses. •  Nipah, Ebola, Pteropine orthoreovirus and Zika remain high-impact threats for global health security. •  Mass gatherings can amplify transmission risks of emerging high-consequence viruses. •  Strengthened surveillance, diagnostics, and One Health strategies are essential for pandemic preparedness. Abstract Emerging infectious diseases have risen significantly in the twenty-first century as ecological disruption, climate change, expanding human–animal interfaces , and global mobility intensify opportunities for pathogen transmission . This review synthesizes historical and contemporary evidence across viral, bacterial, fungal, and parasitic threats to charact...

  Abstract Sialic acids (SAs) are abundantly expressed on vertebrate cell surfaces and are widely recognized as key viral attachment factors , particularly for influenza viruses . However, their role remains understudied in other orthomyxoviruses, such as thogoto and quaranja viruses , which are tick-borne viruses sporadically infecting humans. Enzymatic removal of SAs increased the infectivity of Thogoto and Dhori viruses , as well as pseudotypes carrying the glycoproteins of Oz, Sinu, and Wellfleet Bay viruses . A similar effect on pseudotype infectivity was observed following the binding of specific lectins to SAs. These findings indicate that, in contrast to influenza viruses, SAs act as a barrier to the entry of these orthomyxoviruses . Experimental evolution of the Sinu and Wellfleet Bay virus glycoproteins revealed point mutations that partially overcame this barrier . Given the abundance of sialic acids in mucosal tissues, we speculate that SAs may contribute to the inabili...

  Summary Highly pathogenic avian influenza A(H5N1) viruses have been circulating among wild birds and are enzootic in poultry in some areas of the world with spillover to a wide range of terrestrial and marine mammals. Since 1997, sporadic animal to human , primarily poultry to human, transmission of highly pathogenic avian influenza A(H5N1) viruses has been reported in 25 countries . More recently there have been locally acquired infections in the Americas due to the 2.3.4.4b clade of the virus. Most of the recently detected human infections in the USA have been relatively mild but there have been cases of critical illness reported in several countries. In this Grand Round we present the first locally acquired highly pathogenic avian influenza A(H5N1) virus infection in Canada , which was in a 13-year-old female, who developed severe disease requiring prolonged critical care . She was infected with a clade 2.3.4.4b, genotype D1.1 virus and developed evidence of cytokine storm and...

  Abstract Objective :  This systematic review aimed to assess the clinical effectiveness and safety profile of baloxavir marboxil for managing influenza in pediatric populations . Methods :  This review has been registered on the INPLASY platform (INPLASY2025110063). Designed in accordance with the PRISMA 2020 guidelines, we searched four major biomedical databases (PubMed, Embase, Web of Science, Cochrane Library) covering publications from January 1, 2015, to January 30, 2025 . Eligibility criteria encompassed both randomized controlled trials and observational cohort studies evaluating this antiviral agent in children with laboratory-confirmed influenza. Methodological rigor was appraised using the Cochrane Collaboration's risk of bias instrument for randomized controlled trials (RCTs) and the Newcastle-Ottawa Quality Assessment Scale for cohort studies. Statistical synthesis was conducted using RevMan 5.3 software (Version 5.3.5) with metafor package implementation. ...

  Abstract Ebola virus (EBOV) is the causative agent of Ebola disease (EBOD), a viral hemorrhagic fever with a notably high case fatality rate . Current treatments for EBOD are limited to monoclonal antibodies or two licensed viral vector vaccines , a recombinant vesicular stomatitis virus (rVSV)-vectored vaccine or an adenovirus and modified vaccinia Ankara regimen. However, comparisons of protection, efficacy, and durability with alternative nucleotide platforms remain understudied . Here, we evaluated the immunogenicity of an mRNA vaccine expressing the EBOV glycoprotein (GP) in parallel with rVSV- and DNA-based vaccine platforms . The mRNA EBOV-GP vaccine , formulated in lipid nanoparticles , elicited significantly higher levels of total IgG and neutralizing antibody titers compared to the rVSV-EBOV-GP vaccine. Linear antibody epitope analysis indicated a preference for targeting the mucin-like domain in EBOV-GP1 following rVSV-based vaccination, while the mRNA platform distinc...

  Abstract Highly pathogenic H5Ny influenza A viruses are causing unprecedented, season-independent outbreaks across avian and mammalian species , including dairy cattle , a novel reservoir. The sialoside-binding properties of influenza A hemagglutinin (HA) are strongly related to its ability to infect and transmit between hosts . Mucin-like O-glycans , omnipresent in respiratory tracts, have been understudied as viral receptors due to their complexity. To address this, we synthesized 25 O-linked glycans with diverse sialosides , including modifications by fucosides and sulfates . Our findings reveal that H5Ny 2.3.4.4b viruses bind core 3 sialyl-Lewisx and Sia-Gal-β3GalNAc, O-linked glycans not recognized by classical H5 or other avian viruses . By determining crystal structures, we resolved the structural features of four glycans in an H5 hemagglutinin (HA) from a 2016 2.3.4.4b virus . While these viruses do not bind human-type receptors , their broad receptor specificity enhances...

  Abstract Here we investigated the pathogenesis and contact transmission of bovine- and human-derived highly pathogenic avian influenza (HPAI) H5N1 clade 2.3.4.4b genotype B3.13 viruses in mammalian models . Using reverse genetics , we rescued three naturally occurring viruses : rTX2/24 (bovine-derived), rTexas/37 and rMichigan/90 (both human-derived), and compared their infection dynamics , replication and pathogenicity with the wild-type bovine TX2/24 strain in vitro and in vivo . All four viruses demonstrated comparable replication kinetics in four mammalian cell lines. However, the rMichigan/90 strain exhibited significantly smaller plaques in bovine and human cells . In vivo studies showed that mice infected with any of the viruses succumbed to infection within 4-5 days ; however, mice infected with the rMichigan/90 virus exhibited slightly lower viral replication and shedding compared to the other strains. Similarly, as in the mouse experiments, in hamsters, all viruses indu...

  Abstract The association between vaccine efficacy (VE) and force of infection (FoI) remains incompletely understood . Previous analyses have been primarily based on trial-level summary data—not accounting for the effect of time and constrained by the number of trials. Here, we leverage individual-level data from three phase 3 randomized, placebo-controlled COVID-19 vaccine trials —the COVE trial (Moderna, CoVPN3001), the AZD1222 trial (AstraZeneca, CoVPN3002), and the ENSEMBLE trial (Janssen/Johnson & Johnson, CoVPN3003)—and contemporaneous geographic-location-specific SARS-CoV-2 surveillance data from the start of the pandemic through November 14, 2021 (including the blinded follow-up periods of the trials) to conduct five cohort- and vaccine-specific analyses: COVE (U.S.), AZD1222 overall (U.S. + non-U.S.), AZD1222 U.S., ENSEMBLE overall (U.S. + non-U.S.), and ENSEMBLE U.S. In AZD1222 U.S., higher VE was associated with higher FoI (p = 0.01). In ENSEMBLE overall, lower VE w...

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  Abstract Since early-2024 unprecedented outbreaks of highly pathogenic avian influenza H5N1 clade 2.3.4.4b have been ongoing in dairy cattle in the United States with significant consequences for the dairy industry and public health . Estimation of key epidemiological parameters is required to support outbreak response , including predicting the likely effectiveness of interventions and testing strategies . Here, we pool limited publicly available data from four studies of naturally and experimentally infected dairy cattle. We quantify Ct value trajectories of infected dairy cattle and the relationship between Ct value and the log-titer of infectious virus , a proxy for infectiousness . We estimate that following infection minimum Ct values are rapidly reached within 1–2 days with a population mean Ct value of 15.7 (12.9, 18.4). We identify a threshold Ct value of 21.8 (19.9, 24.6), with values of Ct value above this threshold representing little-to-no infectious viral load . Fin...

  Abstract Highly pathogenic avian influenza H5N1 viruses of clade 2.3.4.4b have caused widespread avian mortality and sporadic mammalian infections , raising concerns about their potential for efficient replication in the human population . Efficient replication in the human upper respiratory tract is considered a key barrier to transmission . Here, we demonstrate that an H5N1 virus isolated from bovine milk in Texas in 2024 (H5N1Tex/24) replicates as efficiently as the 2009 pandemic H1N1 virus (H1N1HH4/09) in well-differentiated human nasal epithelial cells . These cells express both avian- and human-type influenza receptors , indicating receptor adaptation is unnecessary for entry . H5N1Tex/24 replicates effectively at 33 degrees Celsius , reflecting nasal cavity temperature , whereas earlier avian H5N1 strains require 37 degrees Celsius, suggesting that H5N1Tex/24 has acquired another key adaptive feature to the human upper respiratory tract. H5N1Tex/24 remains sensitive to int...

  BMJ MARTIN DS, Doidge JC, Gould D, Shahid T, et al The impact of skin tone on performance of pulse oximeters used by NHS England COVID Oximetry @home scheme: measurement and diagnostic accuracy study. BMJ. 2026;392:e085535. PubMed           Abstract available Int J Infect Dis AMODIO E, Aiello R, Battisti M, Casuccio A, et al Past Behavior Predicts Future Protection: Uncovering Key Drivers of Influenza Vaccine Acceptance in Italy in the Post-Pandemic Era. Int J Infect Dis. 2026 Jan 8:108379. doi: 10.1016/j.ijid.2026.108379. PubMed           Abstract available SEO G, Joo H, Song K, Kim M, et al Static and Dynamic Scoring Systems for Post-acute Sequelae of SARS-CoV-2 in a Korean Cohort. Int J Infect Dis. 2026 Jan 9:108378. doi: 10.1016/j.ijid.2026.108378. PubMed           Abstract available PIOVESAN C, Fabiani M, Pezzotti P, Ramigni M, et al Mortality for causes un...

  Antiviral Res LEEKHA A, Reichel K, Hurst B, Varadarajan N, et al Therapeutic intranasal delivery of NanoSTING provides broad protection against seasonal and highly pathogenic influenza strains. Antiviral Res. 2026 Jan 14:106342. doi: 10.1016/j.antiviral.2026.106342. PubMed           Abstract available BMJ MARTIN DS, Doidge JC, Gould D, Shahid T, et al The impact of skin tone on performance of pulse oximeters used by NHS England COVID Oximetry @home scheme: measurement and diagnostic accuracy study. BMJ. 2026;392:e085535. PubMed           Abstract available Drug Saf PALMER M, Seekins D, Avigan M, Marcinak J, et al The Impact of COVID-19 and COVID-19 Vaccination on Detection, Assessment, and Management of Suspected Acute Drug-Induced Liver Injury Occurring during Clinical Trials: Consensus Recommendations from the IQ DILI Initiative. Drug Saf. 2026;49:9-25. PubMed        ...

  Di Smiley.toerist - File:Madrid Atocha 1981.jpg, CC BY-SA 3.0,  https://commons.wikimedia.org/w/index.php?curid=19532692 Source:  Link:  https://it.wikipedia.org/wiki/Fiat_Ferroviaria ____

  Abstract In 2024, an unprecedented outbreak of H5N1 high pathogenicity avian influenza was detected in dairy cattle in the USA resulting in spillbacks into poultry, wild birds and other mammals including humans . Here, we present molecular and virological evidence that the cattle B3.13 genotype H5N1 viruses rapidly accumulated adaptations in polymerase genes that enabled better replication in bovine cells and tissues , as well as cells of other mammals including humans . We find evidence of several mammalian adaptations in cattle including PB2 M631L , which is found in all cattle sequences, and PA K497R , which is found in the majority. Structurally, PB2 M631L maps to the polymerase-ANP32 interface , an essential host factor for viral genome replication. We show that this mutation adapts the polymerase to better interact with bovine ANP32 proteins , particularly ANP32A, and thereby enhances virus replication in bovine mammary systems and primary human airway cultures . We show th...

  Di Brooksbank - Opera propria, CC BY-SA 4.0,  https://commons.wikimedia.org/w/index.php?curid=38676394 Source:  Link:  https://it.wikipedia.org/wiki/Fiat_Ferroviaria ____

  Abstract Previous studies have documented an increased risk for thrombotic events 30 days after COVID-19 infection , but less is known about this risk beyond 30 days or compared with risk after other infectious acute respiratory illnesses (ARIs). By using PCORnet data from April 1, 2022–April 30, 2023 , we compared the incidences of thrombotic events in the year after COVID-19 illness with other ARI diagnoses in hospitalized and nonhospitalized patients. Overall, the risk for any thrombotic event was higher among patients with COVID-19 compared with patients with other ARIs (incidence ratio 1.63; p<0.05). Nonhospitalized patients with COVID-19 had a 73% increased risk for a thrombotic event in the year after acute illness compared with nonhospitalized patients with ARI (p<0.05). The increased risk for thrombotic events in the year after COVID-19 emphasizes the need for stroke awareness for patients and healthcare professionals. Source:  Link:  https://wwwnc.cdc.go...

  Abstract Human non-polio enteroviruses (NPEVs) cause a plethora of infections in humans, ranging from mild to severe neurological diseases including aseptic meningitis . NPEVs are the leading cause of aseptic meningitis in both children and adults worldwide . In Russia , reports of NPEV infections have surged, especially in the post-COVID era starting in 2022, with elevated infection rates into 2023 . A comprehensive examination of the whole genome is crucial for understanding the evolution of NPEV genes and for predicting potential outbreaks. This study focused on identifying the circulating NPEV strains in the Ural Federal District and Western Siberia , using Sanger sequencing and next-generation sequencing (NGS) methodologies. Biological samples were collected from (n = 225) patients diagnosed with aseptic meningitis. Bioinformatics analysis targeted the nucleotide sequences of the major capsid protein (partial VP1) gene fragment, and the assembly of whole NPEV genomes. A tota...

  {Excerpt} Time Period: January 04, 2026 - January 10, 2026 -- H5 Detection :  8 site(s) ( 1.5% ) -- No Detection :  541 site(s) ( 98.5% ) -- No samples in last week :  66 site(s) (...) Source:  Link:  https://www.cdc.gov/nwss/rv/wwd-h5.html ____