Abstract:
:MARC-145 cell line is commonly used to isolate porcine reproductive and respiratory syndrome virus (PRRSV) for diagnostics, research and vaccine production, but it yields frustratingly low success rates of virus isolation (VI). ZMAC cell line, derived from porcine alveolar macrophages, has become available but its utilization for PRRSV VI from clinical samples has not been evaluated. This study compared PRRSV VI in ZMAC and MARC-145 cells from 375 clinical samples (including 104 lung, 140 serum, 90 oral fluid, and 41 processing fluid samples). PRRSV VI success rate was very low in oral fluids and processing fluids regardless of using ZMAC or MARC-145 cells. PRRSV VI success rates from lung and serum samples were significantly higher in ZMAC than in MARC-145 cells. Lung and serum samples with CT<30 had better VI success. PRRSV-2 in genetic lineages-1 and -8 were isolated more successfully in ZMAC than in MARC-145 whereas PRRSV-2 in genetic lineage-5 were isolated in two cell lines with similar success rates. For samples with VI positive in both ZMAC and MARC-145, 14 of 23 PRRSV-2 isolates had similar titers in two cell lines. Fifty-one of 95 (53.7%) ZMAC-obtained PRRSV-2 or PRRSV-1 isolates grew in MARC-145 and all 46 (100%) MARC-145-obtained isolates grew in ZMAC. In summary, ZMAC allows better isolation of a wide range of PRRSV field strains; however, not all of the ZMAC-obtained PRRSV isolates grow in MARC-145 cells. This study provides important guidelines to improve isolating PRRSV from clinical samples for further characterization and/or for producing autogenous vaccines.
journal_name
J Clin Microbioljournal_title
Journal of clinical microbiologyauthors
Yim-Im W,Huang H,Park J,Wang C,Calzada G,Gauger P,Harmon K,Main R,Zhang Jdoi
10.1128/JCM.01757-20subject
Has Abstractpub_date
2020-12-02 00:00:00eissn
0095-1137issn
1098-660Xpii
JCM.01757-20pub_type
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