Development and Preliminary Application of LAMP Visual Rapid Detection Method of Seneca Virus A
In order to develop a rapid detection method for Seneca virus A(SVA),five pairs of specific LAMP primers in the highly conserved region of SVA genome were designed in this study.A specific ladder-like band larger than 220 bp was amplified in 62℃ water bath for 55 min.The resulting plasmid was used as the template for sensitivity test.The results showed that the method detected SVA at 5.1 copies/μL,which was 1000 times more sensitive than the conventional PCR.The results of specificity test showed that there was no cross-reactivity with Mycoplasma hyopneumoniae(MPH),porcine pseudorabies virus(PRV),porcine circovirus type 2(PCV2),porcine circovirus type 3(PCV3),swine fever virus(CSFV)and porcine reproductive and respiratory syndrome virus(PRRSV).In addition,72 cases suspected of SVA infection was tested using this method and the positive rate was 33%(24/72).Compared with the conventional PCR,the LAMP visual method developed here was simple,rapid,specific and economical,which provided a more suitable method for clinical detection of SVA.