Journal
JOURNAL OF VIROLOGICAL METHODS
Volume 234, Issue -, Pages 87-89Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jviromet.2016.04.006
Keywords
PRRSV; RT-qPCR; Replication kinetics; Viral loads
Funding
- National High Technology Research and Development Program of China [2011AA10A213]
- Special Fund for Agro-scientific Research in the Public Interest [201203056]
- State Key Laboratory of Veterinary Biotechnology [SKLVBF201410]
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Porcine reproductive and respiratory syndrome virus (PRRSV) has become an important pathogen for the swine industry, and has resulted in substantial economic losses. In 2006, highly pathogenic PRRSV (HP-PRRSV) belonging to genotype 2 was first identified in China. Here, the replication kinetics of genotype 2 PRRSV strains were estimated in vitro in MARC-145 cells and porcine alveolar macrophages (PAMs) using a TaqMan-based real-time quantitative reverse transcription polymerase chain reaction (RT-qPCR) assay. The lower limit of detection was 10 copies/mu L, and the assay was linear between 10(1) and 10(8) copies/mu L. The intra-assay coefficients of variation were 0.81-1.36%, and the inter-assay coefficients of variation were 1.77-2.56%. Compared to the low pathogenicity CH-1a-F45 strain, the viral loads of the highly pathogenic HuN4-F45 strain were 10(0.5)-10(1.05) and 10(0.84)-10(1.35) times greater in MARC-145 cells and PAMs, respectively from 12 to 9611 after infection (P < 0.01). This study is the first to demonstrate that the HuN4-F45 strain replicated at higher levels than CH-1a-F45 in MARC-145 cells and PAMs, suggesting that HuN4-F45 has more robust virus amplification efficiency than CH-1a-F45 in vitro. (C) 2016 Elsevier B.V. All rights reserved.
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