title: Rapid pre-clinical detection of classical swine fever by reverse transcription loop-mediated isothermal amplification.
abstract: The usefulness of reverse transcription loop-mediated isothermal amplification (RT-LAMP) for rapid pre-clinical detection of classical swine fever virus (CSFV) infection was evaluated. The RT-LAMP reaction could be finished in 60 min under isothermal condition at 65 degrees C by employing a set of four primers targeting the 5' untranslated region of CSFV. The RT-LAMP assay of CSFV showed higher sensitivities than that of RT-PCR, with a detection limit of 5 copies per reaction. No cross-reactivity was observed from the samples of other related viruses including porcine circovirus type 2, porcine parvovirus, porcine pseudorabies virus, Japanese encephalitis virus, and porcine reproductive and respiratory syndrome virus. The detection rates of CSFV RT-LAMP, RT-PCR and virus isolation for samples including blood, tonsil, nasal and rectal swabs from uninoculated pigs without any clear clinical symptom were 89%, 78% and 71%, respectively. Furthermore, all of the assays showed higher sensitivity for blood and tonsil swabs samples than nasal and rectal swabs. These results indicate that the CSFV RT-LAMP assay is a valuable tool for its rapid, cost-effective detection and has potential usefulness for rapid pre-clinical detection and surveillance of classical swine fever in developing countries.
authors.affiliation: Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 1 Xujiaping Road, Chengguan District, Lanzhou, Gansu Province 730046, China.
authors.forename: Hao-tai
authors.initials: HT
authors.lastname: Chen
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.forename: Li-na
authors.initials: LN
authors.lastname: Ma
authors.forename: Yan-ping
authors.initials: YP
authors.lastname: Ma
authors.forename: Yao-zhong
authors.initials: YZ
authors.lastname: Ding
authors.forename: Xiang-tao
authors.initials: XT
authors.lastname: Liu
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.forename: Li-qing
authors.initials: LQ
authors.lastname: Ma
authors.forename: Yong-guang
authors.initials: YG
authors.lastname: Zhang
authors.forename: Yong-sheng
authors.initials: YS
authors.lastname: Liu
mesh_terms: D000818:Animals; D006691:Classical Swine Fever / Q000175:diagnosis*; D006692:Classical Swine Fever Virus / Q000235:genetics* / Q000302:isolation & purification*; D021141:Nucleic Acid Amplification Techniques / Q000379:methods*; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000662:veterinary; D012680:Sensitivity and Specificity; D013552:Swine