Detection of a novel porcine circovirus 4 in Korean pig herds using a loop-mediated isothermal amplification assay

Da Young Kim, Hye Ryung Kim, Jong Hyun Park, Na Young Kwon, Jong Min Kim, Jae Kyeom Kim, Ji hoon Park, Kyoung Ki Lee, Seong Hee Kim, Won Il Kim, Young S. Lyoo, Choi Kyu Park

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

A novel porcine circovirus 4 has been recently identified in China and Korea. A sensitive and specific diagnostic method is urgently required to detect the virus in field samples. We developed a loop-mediated isothermal amplification (LAMP) the assay for the visual detection of PCV4 and evaluated its sensitivity, specificity, and applicability in clinical samples. This assay's results can be directly visualized by the naked eye using hydroxynaphthol blue after incubation for 40 min at 64 °C. The assay specifically amplified PCV4 DNA and no other viral nucleic acids. The sensitivity of the assay was <50 DNA copies/reaction, which was 10 times more sensitive than conventional polymerase chain reaction (cPCR) and comparable to real-time PCR (qPCR). Clinical evaluation revealed that the PCV4 detection rate in individual pig samples and at the farm level was 39.3 % (57/145) and 45.7 % (32/70), respectively, which were higher than cPCR (46 samples, 24 farms) and qPCR (52 samples, 29 farms) results. Cumulatively, owing to the advantages of high sensitivity and specificity, direct visual monitoring of the results, no possibility for cross-contamination, and being a low-cost equipment, the developed LAMP assay will be a valuable tool for the detection of the novel PCV4 in clinical samples, even in resource-limited laboratories.

Original languageEnglish
Article number114350
JournalJournal of Virological Methods
Volume299
DOIs
StatePublished - Jan 2022

Keywords

  • Loop-mediated isothermal amplification
  • Porcine circovirus 4
  • Visual monitoring

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