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Acta Microbiologica Hellenica

Acta Microbiologica Hellenica (AMH) is an international, peer-reviewed, open access journal on medical microbiology, and is published quarterly online.
It is the official journal of the Hellenic Society for Microbiology (HMS). Society members receive discounts on the article processing charges.

All Articles (73)

West Nile Virus: Insights into Microbiology, Epidemiology, and Clinical Burden

  • Andrea Marino,
  • Ermanno Vitale and
  • Antonino Maniaci
  • + 8 authors

West Nile Virus (WNV), a mosquito-borne flavivirus first identified in Uganda in 1937, has emerged over the past quarter century as a major global public health threat. Since its introduction into North America in 1999, WNV has become the leading cause of arboviral neuroinvasive disease, with recurrent outbreaks continuing across Europe, Africa, and the Americas. This review provides a comprehensive overview of the microbiology, epidemiology, and clinical impact of WNV. We discuss the molecular biology of the virus, highlighting its genomic organization, replication strategies, and the structural and non-structural proteins that underpin viral pathogenesis and immune evasion. The complex enzootic transmission cycle, involving Culex mosquitoes and diverse avian reservoir hosts, is examined alongside ecological and climatic determinants of viral amplification and spillover into humans and equines. The clinical spectrum of WNV infection is outlined, ranging from asymptomatic seroconversion to West Nile fever and life-threatening neuroinvasive disease, with particular emphasis on risk factors for severe outcomes in older and immunocompromised individuals. Current approaches to diagnosis, supportive management, and vector control are critically reviewed, while challenges in vaccine development and the absence of effective antiviral therapy are underscored. Finally, we address future research priorities, including therapeutic innovation, predictive outbreak modeling, and genomic surveillance of viral evolution. WNV exemplifies the dynamics of emerging zoonotic diseases, and its persistence underscores the necessity of a coordinated One Health approach integrating human, animal, and environmental health. Continued scientific advances and public health commitment remain essential to mitigate its enduring global impact.

8 November 2025

West Nile Virus (WNV) transmission cycle. The virus is maintained in an enzootic cycle (black double arrow) between Culex mosquitoes and avian hosts, which act as reservoirs and amplifiers. Some mosquito species function as bridge vectors, transmitting WNV to incidental hosts such as humans and horses (Red arrows), who are considered dead-end hosts because they do not sustain transmission. Environmental factors (temperature, rainfall, and migratory bird movements) strongly influence both vector abundance and viral spread, shaping the intensity and geographic distribution of outbreaks (Green Dashed Arrows).

The Challenge of Endocarditis in Burn Patients: A Retrospective Cohort Study

  • Francesco Coletta,
  • Angela Sinagoga and
  • Martina Mariani
  • + 12 authors

Severely burned patients are at high risk of local and systemic infections due to skin barrier loss. Their clinical management is complex and requires coordinated intensive care and infection prevention strategies. Diagnosing infective endocarditis (IE) in this population is particularly difficult due to overlapping symptoms and limited diagnostic specificity. Common pathogens include Staphylococcus aureus, Pseudomonas aeruginosa, and Acinetobacter baumannii. We conducted a retrospective cohort study on 543 patients with burns affecting >18% of total body surface area (TBSA), admitted to our Burn Intensive Care Unit (BICU) from 2019 to 2024. The incidence of infective endocarditis was 1.47%, involving aortic (75%), mitral (12.5%), and tricuspid (12.5%) valves. Pathogens identified included S. aureus, Klebsiella pneumoniae, A. baumannii, and P. aeruginosa. This incidence is significantly higher than that in the general population. Mortality reached 50%, with an overall 3-month mortality of 75%. The literature on IE in burn patients is scarce, and the role of antibiotic prophylaxis remains controversial. Infective endocarditis in burn patients, although rare, represents a severe complication with high mortality. Early diagnosis and coordinated multidisciplinary care are essential to improve patient outcomes.

7 November 2025

Valves affected by endocarditis.

The COVID-19 pandemic resulted in high morbidity and mortality, as well as severe social and economic disruption globally. Since the pandemic began in 2019, the severe acute respiratory syndrome, coronavirus 2, has undergone numerous changes, resulting in the emergence of new variants and subvariants. The emergence of new variants of the virus poses a challenge to scientists. There is currently no SARS-CoV-2 variant meeting the criteria of variants of concern, whereas the only variant of interest is JN.1, and there are six variants under monitoring: LP8.1, NP1.8.1, XEC, KP.3, KP.3.1.1 and the latest, XFG (Stratus). Although the latter appears to be more transmissible than the others, genomic evidence indicates that it is less aggressive than some recent variants. Nevertheless, continuous genomic surveillance of COVID-19 is still important to detect any new variants that could threaten public health. Numerous therapeutic strategies, such as drugs, vaccines, and nutritional supplements, are being used to treat COVID-19. This narrative review is an overview of COVID-19 and its various facets, from the number of cases to the therapies used, the current variants, and the ongoing clinical trials, specifically focusing on the most recent studies.

6 November 2025

COVID-19 death cases worldwide (a) cumulative total; (b) cumulative total (WHO regions) [6].

Genome Editing Against HPV-Driven Cancers: From Bench to Clinic

  • Muharrem Okan Cakir,
  • Melis Selek and
  • Betul Yilmaz
  • + 2 authors

Genome editing technologies, including CRISPR/Cas9, TALENs, and ZFNs, offer promising approaches to disrupt HPV oncogenes E6 and E7, thereby restoring tumor-suppressor pathways. In this review, we summarize recent preclinical findings demonstrating selective apoptosis and tumor regression in HPV-positive cell and animal models, as well as early-phase clinical studies exploring local CRISPR-based therapies. We also compare the relative strengths and limitations of major editing platforms, discuss delivery strategies, and highlight their potential integration with immunotherapy and conventional treatments. While preclinical studies show encouraging efficacy (e.g., up to 60% tumor regression in xenograft models and marked reactivation of p53/pRb pathways), translation into routine practice remains limited by challenges such as efficient delivery, minimizing off-target effects, long-term safety, cost, and ethical considerations. Continued optimization of high-fidelity nucleases, tissue-specific delivery systems, and genotype-tailored guide RNAs will be essential. Genome editing therefore represents a potential future addition to the therapeutic landscape of HPV-related diseases, but substantial barriers must be addressed before clinical implementation.

31 October 2025

PRISMA 2020 flow diagram of the study selection process. * Databases include PubMed, Scopus, and Web of Science. ** Records excluded: non-original, non-English, or unrelated to HPV/genome editing studies.

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Acta Microbiol. Hell. - ISSN 2813-9054