ETIDIOH - NEW

Abstract In February 2024, H5N1 highly pathogenic avian influenza viruses (HPAIVs) of clade 2.3.4.4b were first reported in dairy cows in the USA. Subsequent multiple outbreaks on dairy farms and sporadic human infections have raised substantial public health concerns . In the same year, four H5N1 HPAIVs of clade 2.3.4.4b were isolated from ducks and geese in live poultry markets (LPMs) spanning seven provinces in China . Evolutionary analysis demonstrated that these viruses had undergone two genetic reassortments with H5 influenza viruses from wild birds in different countries. Except for 565/H5N1, the other three viruses exhibited over 99% genetic homology with avian-origin H5N1 HPAIVs from South Korea and Japan . Notably, 571/H5N1 demonstrated high replication efficiency in bovine-derived cells , particularly in bovine mammary epithelial (MAC-T) cells, and caused 16.7% (1/6) mortality in mice at a dose of 10⁵ EID₅₀/50 μL, indicating its zoonotic potential . Given the potential cross...

Situation at a glance Between 1 March and 21 April 2025, the Ministry of Health (MoH) of the Kingdom of Saudi Arabia (KSA) reported nine cases of Middle East respiratory syndrome coronavirus (MERS-CoV) infection . Two of these cases died . Among the nine cases, a cluster of seven cases were identified in Riyadh , including six health and care workers who acquired the infection from caring for a single infected patient . The cluster was identified through contact tracing and subsequent testing of all contacts, with four of the six health and care workers being asymptomatic and two showing only mild , nonspecific signs. The notification of these cases does not change the overall risk assessment , which remains moderate at both the global and regional levels. These cases show that the virus continues to pose a threat in countries where it is circulating in dromedary camels and spilling over into the human population . WHO recommends implementation of targeted infection prevention and cont...

Abstract Infections by influenza A virus (IAV) are a significant cause of global mortality . The pathogenesis of the infection is usually studied in terms of direct viral-induced damage or the overreactive immune response that continues after the virus is cleared. However, factors such as the initial infectious dose , the early response after infection in different cell types, and the presence of autoantibodies for relevant antiviral cytokines like type I IFNs seem to influence the course of the infection and lead to fatal outcomes . In this article, we address the current knowledge about the early events during influenza virus infection, which are important for their participation in influenza-derived pathogenesis. Source: Viruses,  https://www.mdpi.com/1999-4915/17/5/694 ____

Abstract Background & objectives A three-year-old male child from West Bengal, India , with severe acute respiratory symptoms , was confirmed in the laboratory with LPAI H9N2 virus infection under the Indian Council of Medical Research (ICMR) - Pan India Acute Respiratory Infections (ARI) / Severe Acute Respiratory Infections (SARI) surveillance through the Virus Research and Diagnostic Laboratories network. Methods Common respiratory viruses were detected by real-time PCR, followed by subtyping of Influenza A for seasonal and avian viruses. The identified H9N2 virus was isolated and further characterised, including whole genome sequencing. Antibody response was performed in serum samples of the case and family members. Results Complete genome sequencing revealed a G1 lineage (Middle East B sub-lineage). Bayesian evolutionary analyses of the HA gene of Indian H9N2 poultry strains showed three clusters of multiple introductions at the estimated node age of 1999 based on the Human st...

  Public Domain. Source: WikiArt,  https://www.wikiart.org/en/johannes-vermeer/a-lady-standing-at-a-virginal ____

{Excerpts} The 41st meeting of the Emergency Committee under the International Health Regulations (2005) (IHR) on the international spread of poliovirus was convened by the WHO Director-General on 6 March 2025 with committee members and advisers meeting via video conference with affected countries, supported by the WHO Secretariat.   The Emergency Committee reviewed the data on wild poliovirus (WPV1) and circulating vaccine derived polioviruses (cVDPV) in the context of the global target of interruption and certification of WPV1 eradication by 2027 and interruption and certification of cVDPV2 elimination by 2029.  Technical updates were received about the situation in the following countries:  - Afghanistan,  - Algeria,  - Chad,  - Democratic Republic of the Congo (DR Congo),  - Djibouti,  - Ethiopia,  - Germany,  - Pakistan,  - Poland and  - the United Kingdom of Great Britain and Northern Ireland. (...) Based on the curr...

  Di B.Zsolt - Opera propria, CC BY-SA 3.0 , source: WikiPedia. ____

  Antiviral Res MARTIN HJ, Hossain MA, Wellnitz J, Kelestemur E, et al Chemical arsenal for helicase Hunters: Striking the toughest targets in antiviral research. Antiviral Res. 2025;239:106184. PubMed           Abstract available Int J Infect Dis BANHOLZER N, Middelkoop K, Schmutz R, Leukes J, et al Infection prevention and control measures during the COVID-19 pandemic and airborne tuberculosis transmission during primary care visits in South Africa. Int J Infect Dis. 2025 May 6:107921. doi: 10.1016/j.ijid.2025.107921. PubMed           Abstract available J Infect RIEDMANN U, Chalupka A, Richter L, Werber D, et al Underlying health biases in previously-infected SARS-CoV-2 vaccination recipients: a cohort study. J Infect. 2025 Apr 30:106497. doi: 10.1016/j.jinf.2025.106497. PubMed           Abstract available J Med Virol MAZZOTTA V, Lepri AC, Del Borgo C, Lanini S,...

  Ann Intern Med CLEMENTS CM, Carpenter CR In nonsevere influenza, antiviral drugs do not reduce mortality or hospital admissions; some shorten symptom duration. Ann Intern Med. 2025 May 6. doi: 10.7326/ANNALS-25-01324. PubMed           Abstract available Antiviral Res FAGE C, Loison S, Zwygart AC, Poli R, et al Influenza A(H1N1)pdm09 Virus Resistance to Baloxavir, Oseltamivir and Sialic Acid Mimetics in Single and Dual therapies: Insights from Human Airway Epithelia and Murine Models. Antiviral Res. 2025 May 3:106174. doi: 10.1016/j.antiviral.2025.106174. PubMed           Abstract available TAKASHITA E, Yasui Y, Ikegaya A, Saka K, et al Impact of the Polymerase Acidic Protein E199K Substitution in Influenza A Viruses on Baloxavir Susceptibility. Antiviral Res. 2025 May 3:106173. doi: 10.1016/j.antiviral.2025.106173. PubMed           Abstract available Biochem Bio...

Abstract Background The prevalence and transmission of avian influenza viruses (AIVs) in the live poultry market (LPM) is a serious public health concern . This study was to investigate the prevalence of different subtypes of avian influenza viruses in environment of LPM, and to analyze the differences and seasonality of the nucleic acid positive rate (NAPR) of A type, H5, H7, and H9 subtypes in feces, sewage, drinking water, breeding cages, and chopping boards . Methods Feces, breeding cages swabs, drinking water, sewage and chopping boards swabs were collected from live poultry market during 2019–2023 from southern and northern China . Real-time PCR was used to screen for virus subtypes. Viruses were isolated, and deep sequencing was performed to obtain whole-genome sequences. Chi-square test was used for statistical analysis of categorical variable, GraphPad Prism software were used to construct graphs. Results A total of 64,599 environmental samples were collected from live poultry...

ABSTRACT Since 2020, the clade 2.3.4.4b highly pathogenic avian influenza (HPAI) H5N1 viruses have caused unprecedented outbreaks in wild birds and domestic poultry globally , resulting in significant ecological damage and economic losses due to the disease and enforced stamp-out control. In addition to the avian hosts, the H5N1 viruses have expanded their host range to infect many mammalian species , potentially increasing the zoonotic risk . Here, we review the current knowns and unknowns of clade 2.3.4.4b HPAI H5N1 viruses, and we highlight common challenges in prevention. By integrating our knowledge of viral evolution and ecology, we aim to identify discrepancies and knowledge gaps for a more comprehensive understanding of the virus. Ultimately, this review will serve as a theoretical foundation for researchers involved in related avian influenza virus studies, aiding in improved control and prevention of H5N1 viruses. Source: Journal of Virology,  https://journals.asm.org/doi...

{Excerpt} Time Period: April 27, 2025 - May 03, 2025 - H5 Detection :  8 sites ( 2.0% ) - No Detection :  402 sites ( 98.0% ) - No samples in last week :  67 sites (...) Source: US Centers for Disease Control and Prevention,  https://www.cdc.gov/bird-flu/h5-monitoring/index.html ____

Summary Background Mpox, caused by the monkeypox virus, is a serious public health threat in Africa , especially in DR Congo . Previously limited to endemic areas with clade 1a, monkeypox virus has recently spread to non-endemic regions, where clade 1b has emerged . This study provides a clinical comparison of mpox cases in DR Congo regions where clade 1a and clade 1b are prevalent. Methods We conducted a retrospective observational study , analysing PCR-confirmed mpox cases reported from sentinel health zones in seven provinces between Oct 1, 2023, and Sept 31, 2024. Cases from the newly affected provinces (South-Kivu and Kinshasa) were described along with those from four endemic provinces (Mai-Ndombe, Tshuapa, Tshopo, South-Ubangi, and Équateur). Surveillance data, including type of exposure, demographic details, clinical presentation, complications, and outcomes were collected from national surveillance systems and local health facilities, with laboratory confirmation using quantit...

{Source: Wikipedia,  https://commons.wikimedia.org/wiki/File:White_tailed_eagle_raftsund_square_crop.jpg  - Under CC: Christoph Müller (http://www.christophmueller.org), CC BY 4.0 , via Wikimedia Commons} A White tailed eagle was found dead . It was sent to the Swedish Veterinary Agency (formerly National Veterinary Institute) for laboratory analysis as part of the national surveillance program for avian influenza. Source: WOAH,  https://wahis.woah.org/#/in-review/6466?reportId=174166&fromPage=event-dashboard-url ____

ABSTRACT Sporadic human infections of avian influenza virus (AIV) raise significant public health concerns . A critical factor limiting the transmission of AIVs is the shift in receptor-binding preference from Siaα2,3 to Siaα2,6. To reveal the adaptive selection dynamics during the host adaptation process of AIVs, this study generated a viral library with random mutations in the HA gene of the H9N2 strain . Upon passaging the viral library in chickens and mice , the predominantly selected variants exhibited a preference for Siaα2,3 receptors . Notably, the wild-type strain remained dominant in both inoculated and direct-contact chickens, while variants with the ΔL226/R229I substitutions were preferentially selected in mice. Ferrets have a predominance of Siaα2,6 in their respiratory tract. As expected, the variant harboring the N289D mutation, which prefers Siaα2,6 binding, was enriched during in vivo passaging in ferrets . The mice-adapted variant with the ΔL226/R229I mutations causes...

Abstract Low pathogenic H9N2 avian influenza viruses have become widespread in wild birds and poultry worldwide, raising concerns about their potential to spark pandemics or their role in enhancing the virulence and infectivity of H5Nx viruses through genetic reassortment . Therefore, influenza monitoring studies, including those of H9N2 viruses, are crucial for understanding, evaluating, and mitigating the risks associated with avian infections, and have broader implications for global public health. Although H9N2 viruses are not considered enzootic in Kazakhstan , they have been repeatedly detected in wild waterfowls and domestic poultry . In this study, all eight gene segments of influenza A/H9N2 viruses isolated in various regions of Kazakhstan between 2014 and 2020 were sequenced and analyzed. Molecular characterization revealed the presence of genetic markers associated with mammalian infectivity and disease potential . Furthermore, their predicted receptor binding site sequences...

Influenza at the human-animal interface Summary and risk assessment, from 20 March to 22 April 2025 {1}  • New human cases {2}:  From 20 March to 22 April 2025 , based on reporting date, the detection of influenza A( H5N1 ) in four humans and influenza A( H9N2 ) virus in three humans were reported officially.  • Circulation of influenza viruses with zoonotic potential in animals :  High pathogenicity avian influenza (HPAI) events in poultry and non-poultry continue to be reported to the World Organisation for Animal Health (WOAH).{3} The Food and Agriculture Organization of the United Nations (FAO) also provides a global update on avian influenza viruses with pandemic potential.{4}  • Risk assessment {5}:  Sustained human to human transmission has not been reported from these events. Based on information available at the time of the risk assessment, the overall public health risk from currently known influenza viruses circulating at the human-animal inter...