Abstract: This study aimed to establish a recombinase aided amplification-lateral flow dipstick (RAA-LFD) method for simultaneous detection of bovine norovirus(BNoV) and Bovine rotavirus(BRV). According to the principle of RAA primer probe design, this test first designed primers and probes targeted the conserved regions of BNoV RdRp gene and BRV VP7 gene, second prepared the standard recombinant plasmids, then established and optimized the RAA-LFD reaction system, finally the specificity, sensitivity and repeatability of the detection method were also evaluated. At the same time, 168 clinical samples of calves with diarrhea were tested in parallel by the RAA-LFD, PCR and qPCR method. The results showed that the method could amplify the target fragment in 20 minutes at 39 ℃. The sensitivity of this method is 10³ copies·μL^-1 for both BNoV and BRV, and is basically consistent with the detection results of PCR. It has no cross-reaction with bovine coronavirus (BCoV), bovine viral diarrhea virus (BVDV) and infectious bovine rhinotracheitis virus (IBRV). Although the test strip result may be lower than that of the qPCR test, it can be easily observed with the naked eye. In summary, the RAA-LFD method has high sensitivity, and is simple, fast, and does not require specialized equipment or operators, making it ideal for on-site detection.

Key words: bovine norovirus, bovine rotavirus, recombinant enzyme-mediated amplification, lateral flow test strips