Zoonoses have rapidly spread globally, necessitating the implementation of vaccination strategies as a control measure. Emerging and re-emerging vector-borne diseases are among the major global public health concerns. Dengue, a zoonotic viral infection transmitted to humans by a vector, the Aedes mosquito, is a severe global health problem. Dengue is a serious tropical infectious disease, second only to malaria, causing around 25,000 deaths each year. The resurgence of Dengue is mainly due to climate change, demographic transitions and evolving social dynamics. The development of an effective vaccine against Dengue has proven to be a complex undertaking due to four different viral serotypes with distinct antigenic profiles. This review highlights the urgent need to address the dengue threat by exploring the application of biotechnological and -OMICS sciences.

The One Health concept recognises the close interconnection between human, animal, and environmental health. In recent years, this perspective has intensified scientific focus on zoonoses. Among these, arboviruses—viruses transmitted by arthropod vectors—represent an emerging challenge, particularly in the present period strongly conditioned by climate change. Usutu virus (USUV) is a Flavivirus maintained via an enzootic bird–mosquito–bird cycle that infects other vertebrates. USUV is currently a significant animal health concern due to its expanding host range and increasing avian mortality events. Although USUV appears to be less dangerous than other emerging arboviruses in humans, the neurological disorders it can cause are alarming and increase the need for a better understanding of the spread and genetic evolution of USUV, as well as for the stronger promotion of vaccine and antiviral development. As with other arboviruses, treatment for USUV is limited to avoiding contact with mosquitoes, which is not always possible. Since vaccines do not yet exist, the use of modern OMICS sciences may provide comprehensive knowledge for developing effective control and prevention measures to avoid future pandemics and contain current epidemics.

The bluetongue virus (BTV) is the causative agent of bluetongue, a non-contagious viral disease affecting ruminants. It is transmitted by insects of the Culicoides genus. The disease's complexity is reflected in the large number of recognized serotypes. Bluetongue can be particularly severe in sheep, causing symptoms such as fever, facial edema, cyanosis of the tongue, oral lesions, lameness, and high mortality. Cattle serve as a subclinical reservoir. Controlling BTV is a crucial challenge in livestock farming, requiring the identification of innovative vaccination strategies that induce effective immunity against the various circulating serotypes. In this context, the "vaccine paradox" of BTV emerges, revealing a discrepancy between the proven immunological efficacy of available vaccines and their inability to ensure stable epidemiological control. This paper investigates the reasons for this discrepancy and clarifies the structural limitations that prevent current vaccination strategies from achieving this.

Antimicrobial resistance (AMR) surveillance increasingly requires systems that integrate human, animal, food-chain, and environmental data. Escherichia coli (E. coli) is a valuable sentinel organism for this purpose because it is ubiquitous across One Health compartments, easy to isolate and phenotypically test, clinically relevant as both a commensal and an extraintestinal pathogen, and genetically equipped to acquire and disseminate mobile genetic determinants of AMR. This narrative review revises and updates the scientific rationale for using E. coli as an indicator organism in integrated AMR surveillance, with emphasis on current publications and institutional guidance. The evidence supports E. coli as a practical cross-sector indicator, but interpretation requires caution: clonal overlap between sectors is often limited, whereas plasmids, resistance genes, and mobile genetic elements (MGEs) may circulate across ecological boundaries. A robust One Health surveillance system should therefore combine standardized sampling, harmonized antimicrobial susceptibility testing, whole-genome sequencing (WGS), selected long-read sequencing for plasmid reconstruction, environmental and wastewater surveillance, metagenomics, and, for selected questions, proteomic approaches that assess the expression and function of resistance mechanisms. The review proposes a pragmatic framework for surveillance design, interpretation, and action. E. coli should not be treated as a universal proxy for all AMR hazards, but as a high-value sentinel when data are generated and interpreted through explicit epidemiological objectives, comparable methods, and sector-specific metadata. Finally, this review briefly summarizes the challenges confronting AMR surveillance and recommends key actions to overcome them.