ArticleViruses2025
Etiological Spectrum of Acute Respiratory Infections in Bulgaria During the 2023-2024 Season and Genetic Diversity of Circulating Influenza Viruses.
Article in Viruses, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
6 citing papers in PubMed.
- Evolution of swine influenza surveillance and one health governance in Taiwan: from zoonotic risk management to integrated preparedness.Veterinary research communications · 2026Review
- Epidemic trends and characteristics of notifiable infectious diseases in mainland China during the COVID-19: a nationwide surveillance study, 2020-2024.Journal of global health · 2026Article
- Viral pathogens in the etiology of acute respiratory infections in Bulgaria during the 2024-2025 season and genetic diversity of circulating influenza viruses.Frontiers in microbiology · 2026Article
- Campus-based genomic surveillance uncovers early emergence of a future dominant A(H3N2) influenza clade.iScience · 2025Article
- Clinical features and outcomes of viral respiratory infections in adults during the 2023-2024 winter season.Scientific reports · 2025Observational
- Respiratory infections in the post-COVID-19 era: impact, prevalence, and clinical characteristics of bacterial and viral co-infections.Frontiers in medicine · 2025Article
Corrections and comments
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Authors and funding
10 authors.
Funding
Abstract
Influenza poses a serious threat to both individual and public health. This study aimed to investigate the virological and epidemiological characteristics of influenza infections and to explore the genetic diversity of the circulating influenza viruses. In total, 1886 nasopharyngeal specimens from patients with acute respiratory illnesses were tested against 13 respiratory viruses using a multiplex real-time PCR. Whole-genome sequencing, phylogenetic, and amino acid analyses of representative influenza strains were performed. At least one respiratory virus was detected in 869 (46.1%) patients; 87 (4.6%) were co-infected with two or three viruses. Influenza A(H1N1)pdm09 was the most prevalent virus (16.1%), followed by rhinoviruses (8.1%) and RSV (6.7%). Hemagglutinin (HA) genes of the 74 influenza A(H1N1)pdm09 viruses were categorized in subclades C.1.8, C.1.9, and C.1 within clade 5a.2a and D1, D.2, and D.3 within clade 5a.2a.1. The A(H3N2) viruses analyzed belonged to clade 2a.3a.1, subclades J.2 and J.1. The sequenced B/Victoria lineage viruses fell into clade V1A.3a.2, subclades C.5.6 and C.5.7. Amino acid substitutions in most viral proteins were identified compared with the vaccine strains, including in the HA antigenic sites. This study demonstrated the dominant distribution of the influenza A(H1N1)pdm09 virus among the respiratory viruses studied and the genetic diversity of the circulating influenza viruses.
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