Current Research on Influenza Viruses: Evolution, Immunity, and Countermeasures

A special issue of Pathogens (ISSN 2076-0817). This special issue belongs to the section "Viral Pathogens".

Deadline for manuscript submissions: 31 May 2026 | Viewed by 1239

Special Issue Editors


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Guest Editor
School of Medicine, Southeast University, 87 Ding Jiaqiao, Nanjing 210009, China
Interests: influenza virus; SARS-CoV-2; virus evolution; virus–immune interactions; structural virology

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Guest Editor
College of Veterinary Medicine, University of Florida, Veterinary Medicine Academic Building, 1945 SW 16th Ave Suite V3-111, Gainesville, FL 32608, USA
Interests: influenza virus; antibody design; machine learning; artificial intelligence; high-throughput screening

Special Issue Information

Dear Colleagues,

The influenza virus, which belongs to the family Orthomyxoviridae, is a negative-sense single-stranded RNA virus that is widely spread among different species in nature. It has four species (A, B, C, and D) and, as one of the top ten threats named by the World Health Organization (WHO), the influenza virus continues to pose global pandemic and epidemic threats to humans. The influenza virus evolves rapidly, particularly two of its major surface glycoproteins, hemagglutinin (HA) and neuraminidase (NA). HA and NA are the influenza virus’s major surface antigens, which are continuously exposed to selection pressure from the host. Other essential viral proteins, such as PB2, PB1, PA, NP, M, and NS, also evolve as they play important roles during different aspects of the virus’s lifecycle—for example, viral replication, host adaptation, and immune escape. Therefore, expanding our understanding of how these viral proteins evolve individually or collectively, studying their interaction with host receptors and the immune system, and identifying potential druggable structural domains will provide us with useful insights from which we can create precise virus evolution models, develop next-generation broadly protective vaccines, and design anti-influenza therapies.

This Special Issue includes, but is not limited to, current research on the evolution of the influenza virus, innate and adaptive immunity, and therapeutic methods, as well as vaccine development strategies against the influenza virus. The submission of research articles, review articles, and short communications is welcome.

Dr. Ruipeng Lei
Dr. Yiquan Wang
Guest Editors

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Keywords

  • influenza
  • virus evolution
  • virus–immune interaction
  • vaccine development
  • antiviral treatment

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Published Papers (2 papers)

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Research

16 pages, 3387 KB  
Article
Epidemiological and Genomic Characterization of H5 Subtype Avian Influenza Viruses in Jining City, 2024–2025
by Haixia Yang, Yang Zhang, Xiaoyu Wang, Ting Chen, Yongjian Jia, Huixin Dou, Yangbei Jiao, Feifei He, Yajuan Jiang and Boyan Jiao
Pathogens 2026, 15(5), 521; https://doi.org/10.3390/pathogens15050521 - 12 May 2026
Viewed by 129
Abstract
Objective: The aim of this study was to characterize the epidemiological features and whole-genome characteristics of H5 subtype avian influenza viruses circulating in Jining City during 2024–2025, and to provide scientific evidence for avian influenza prevention and control. Methods: A total [...] Read more.
Objective: The aim of this study was to characterize the epidemiological features and whole-genome characteristics of H5 subtype avian influenza viruses circulating in Jining City during 2024–2025, and to provide scientific evidence for avian influenza prevention and control. Methods: A total of 748 poultry-related environmental samples were collected in March, June, September, and December of 2024–2025. Reverse transcription quantitative real-time polymerase chain reaction (RT-qPCR) was used to detect influenza A virus and H5 subtype viral RNA. H5-positive samples were subjected to whole-genome sequencing and analyzed using bioinformatics tools. Results: Among the 748 samples, the positivity rate of influenza A virus was 16.04% (120/748), and that of the H5 subtype was 8.16% (61/748). The H5 positivity rate in 2025 (11.88%) was significantly higher than that in 2024 (5.37%). Higher positivity rates were observed in March and December compared to June and September. Twelve complete H5 genomes were obtained, including nine H5N1 and three H5N6 strains. All HA genes belonged to clade 2.3.4.4b. Key mutations related to antigenic drift, replication and adaptation were detected in multiple viral proteins. Conclusions: The positivity rate of H5 subtype avian influenza viruses in Jining City showed an increasing trend during 2024–2025, with higher prevalence in winter and spring. The circulating strains predominantly belonged to clade 2.3.4.4b. Antigenic drift-associated mutations in the HA protein were identified in some strains, which may affect vaccine matching. Enhanced surveillance of H5 viruses and regular evaluation of antigenic compatibility between vaccine and circulating strains are recommended to mitigate potential risks posed by viral genetic variation. Full article
11 pages, 1784 KB  
Communication
Antibody Recognition of Highly and Low-Pathogenic A/H5Nx Influenza Viruses in Sera of Mexican Donors
by Maritza Cordero-Ortiz, Mario Solís-Hernández, Marlen Cayetano-Mondragón, Nadia Carrillo Guzmán, Olivia Valenzuela, Verónica Mata-Haro, Luis G. Giménez-Lirola and Jesús Hernández
Pathogens 2026, 15(4), 352; https://doi.org/10.3390/pathogens15040352 - 26 Mar 2026
Viewed by 607
Abstract
Influenza A viruses (IAVs) are among the most common sources of new pandemic strains in humans. Spillover from birds to mammals can lead to viral adaptation in new hosts, as seen with IAV H5N1. H5N2 viruses have also been transmitted successfully to humans [...] Read more.
Influenza A viruses (IAVs) are among the most common sources of new pandemic strains in humans. Spillover from birds to mammals can lead to viral adaptation in new hosts, as seen with IAV H5N1. H5N2 viruses have also been transmitted successfully to humans through contact with infected birds and poultry. In the present study, we evaluated the presence of antibodies against H5Nx viruses in serum samples from a Mexican adult population (n = 476) using the hemagglutination inhibition (HI) test. The analysis included comparisons between sex and age groups. Potential epitopes recognized in the H5 proteins of each strain were predicted using Ellipro. We detected antibodies against H5N1 in 2.5% of the samples, with the highest HI titers of 1:64. The proportion of positive samples for H5N2 2006 was higher (18.9%) than for H5N2 2024 (10.7%). The oldest groups (>50 years old) showed the highest proportion of positives for both viruses, whereas the youngest was for H5N1. These results demonstrate a low proportion of cross-reactive antibodies against the IAV H5N1. Full article
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