Porcine proliferative enteropathy (PPE) is an infectious disease in pigs, caused by Lawsonia intracellularis (LI), affecting their intestines during growth and finishing stages, leading to higher production costs. Current detection methods for LI face two main challenges, delayed results and high costs, making them impractical for large-scale pig farming epidemiological surveys. This study developed a TaqMan-qPCR method using specific probes and primers based on the LI aspartate ammonia lyase genes from GenBank, completing detection in just 45 min. After optimizing reaction conditions, sensitivity analysis revealed that the detection limit of this method was 4.6 copies/μL targeting standard plasmids. The results of the specificity analysis showed no cross-reactivity with other common porcine pathogens, highlighting its specificity. The inter- and intra-group coefficients of variation were both <1%, indicating high reproducibility. Furthermore, the TaqMan-qPCR demonstrated 100% relative sensitivity, and a 92.50% compliance rate compared to conventional PCR, suggesting it could be a complement to the conventional PCR method. In summary, the TaqMan-qPCR method established in this study is not only suitable for epidemiological investigations and early qualitative and quantitative diagnosis of proliferative enteropathy in pigs, but it is also valuable for studying the biological characteristics of LI.

Avian influenza virus (AIV), a zoonotic pathogen capable of cross-species transmission, poses a significant global health threat due to its rapid evolutionary adaptation. This review consolidates evidence from the past decade on AIV-autophagy interactions, emphasizing mechanistic insights and therapeutic potential. Research indicates that various AIV strains can trigger autophagosome formation via viral components, although the completeness of autophagic flux is not fully understood. These virus–host interactions are notably influenced by viral genotypes (e.g., H5N1 vs. H9N2) and host species (avian vs. mammalian). Current studies suggest that modulating autophagy may reduce AIV-induced acute lung injury, with pharmacological agents showing potential in mitigating inflammatory responses. We systematically explore three research areas: (1) strain-specific mechanisms of autophagy induction, (2) host-specific autophagic responses in poultry and human models, and (3) the therapeutic potential of stage-specific autophagy manipulation. This synthesis clarifies critical knowledge gaps, particularly the need for standardized autophagic flux assessment in avian cells, while providing a conceptual framework for developing autophagy-targeted strategies against AIV pathogenesis.

Seneca Valley virus (SVV), also referred to as Senecavirus A (SVA), is an emerging pathogen within the Picornaviridae family. Since its initial identification, SVV has been implicated in the onset of porcine idiopathic vesicular disease (PIVD) across several prominent pig-producing nations globally. Due to the clinical manifestations of SVV being challenging to differentiate from those of significant animal diseases such as foot-and-mouth disease (FMD), it poses considerable economic burdens and biosecurity challenges to the swine industry. This review endeavors to provide a comprehensive synthesis of the current state of research on SVV, systematically detailing its virological characteristics, molecular biology, global epidemiology, and evolutionary dynamics. The focus is placed on elucidating its pathogenic mechanisms in swine and the intricate molecular networks that govern its interactions with the host. Particular attention is given to the strategies employed by viral proteins to counteract host innate immune responses and to modulate autophagy, apoptosis, and other critical signaling pathways. Furthermore, we consolidate the existing diagnostic technologies and advancements in vaccine development, and we explore prospective research directions, aiming to furnish a reference for the clinical prevention and control of SVV.

Rotavirus is a leading cause of severe, dehydrating diarrhea in infants and young animals, causing significant global morbidity and mortality. For decades, research was hindered by challenges in establishing reverse genetics systems due to the virus’s complex segmented genome and poor cell culture adaptation. The first helper virus-dependent system (2006) was limited by low efficiency. A 2017 breakthrough established the first fully plasmid-based system, which eliminated helper viruses and revolutionized the field. Subsequent optimizations, such as codon modification and CRISPR/Cas9 integration, have significantly enhanced efficiency, enabling viable systems for diverse human and animal strains. This narrative review summarizes the evolution and technological milestones of rotavirus reverse genetics. We discuss critical applications in analyzing viral gene function, developing novel vaccines, screening antiviral drugs, and investigating cross-species transmission. Finally, we provide an outlook on the future prospects of this transformative technology.

Avian respiratory diseases, particularly those induced by the avian influenza virus (AIV), Newcastle disease virus (NDV), infectious bronchitis virus (IBV), and infectious laryngotracheitis virus (ILTV), represent a substantial economic threat to the global poultry industry. Several of these viruses can also transmit across species, posing risks to public health security. Given the challenges posed by similar clinical symptoms from different pathogens, the prevalence of co-infections, and rapid viral mutations, rapid, precise, and highly sensitive diagnostic techniques are imperative for effective disease prevention and control, epidemic surveillance, and epidemiological research. This review provides an overview of molecular and immunological diagnostic techniques for major avian respiratory viruses. All covered technologies are evaluated and compared across key performance metrics: target type, analytical sensitivity, multiplex capacity, turnaround time, point-of-care diagnostic techniques (POCT) suitability and application scenarios. Specifically, the review details real-time quantitative PCR (qPCR) and its multiplex formats, isothermal amplification methods including loop-mediated isothermal amplification (LAMP), recombinase-aided amplification (RAA) and recombinase polymerase amplification (RPA), and innovative CRISPR-Cas-based nucleic acid detection systems. It also examines high-throughput sequencing, microarray technologies, and advanced immunological assays enhanced by nanomaterials, recombinant proteins, and single-domain antibodies. The review further discusses integrated, automated, and portable diagnostic platforms, including microfluidics, and smartphone-assisted systems. Finally, the review outlines future trends in avian diagnostic technologies, providing a practical reference for building more efficient and accessible avian disease surveillance and early warning systems.

Avian influenza (AI) continues to threaten global poultry production, with accumulating evidence suggesting that certain commercial layer lines may exhibit increased susceptibility under specific experimental conditions compared with broiler chickens. This narrative review synthesizes published experimental infection studies identified through a comprehensive PubMed search, focusing on low pathogenic H9N2 and highly pathogenic H5N1, H5N2, H7N7, and H7N9 viruses. Although bird age and production stage varied across studies, consistent disparities in immune regulation and viral replication dynamics have been reported. We critically evaluate host determinants underlying these differences—including microRNAs, major histocompatibility complex polymorphisms, sialic acid receptor distribution, gut microbiota, and hormonal influences—and integrate findings across viral subtypes and pathogenicity classes to inform breed-tailored vaccination, nutritional, and therapeutic strategies.