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| 论文摘要： | Frog virus 3-like ranaviruses (FV3-like viruses), particularly FV3 (Frog virus 3), represent typical species within the genus Ranavirus, primarily infecting amphibians and reptiles, thereby posing serious threats to aquaculture and biodiversity conservation. We designed a pair of universal primers and a probe targeting the conserved region of the major capsid protein (MCP) genes of FV3-like viruses. By integrating recombinase-aided amplification (RAA) with lateral flow dipstick (LFD) technology and real-time fluorescence (RF) modification, we established RAA-LFD and RF-RAA assays. The limit of detection (LoD) of RAA-LFD was determined to be 35.4 copies/mu L under optimized amplification conditions at 35 degrees C for 15 min. Similarly, the RF-RAA assay exhibited high specificity with a satisfactory LoD of 3.54 x 102 copies/mu L at 39 degrees C over a duration of 17-20 min. In diagnosing 53 clinical samples infected by an isolated strain of FV3-like viruses, both assays demonstrated consistency with results obtained from real-time fluorescence PCR assay. These experiments indicate that both methods serve as promising alternatives for point-of care testing (POST), adaptable to various scenarios. This study represents the first establishment of RAA-LFD and RF-RAA assays for FV3-likes viruses, enabling rapid and intuitive assessment of detection results while fulfilling on-site testing requirements, thus contributing positively to swift diagnosis and long-term monitoring in aquaculture. |
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