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Open AccessArticle

Evaluation of ViroCyt® Virus Counter for Rapid Filovirus Quantitation

1
Diagnostic Systems Division, US Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702, USA
2
Pathology Division, US Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702, USA
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Author to whom correspondence should be addressed.
Academic Editor: Jens H. Kuhn
Viruses 2015, 7(3), 857-872; https://doi.org/10.3390/v7030857
Received: 17 December 2014 / Revised: 6 February 2015 / Accepted: 16 February 2015 / Published: 20 February 2015
(This article belongs to the Collection Advances in Ebolavirus, Marburgvirus, and Cuevavirus Research)
Development and evaluation of medical countermeasures for diagnostics, vaccines, and therapeutics requires production of standardized, reproducible, and well characterized virus preparations. For filoviruses this includes plaque assay for quantitation of infectious virus, transmission electron microscopy (TEM) for morphology and quantitation of virus particles, and real-time reverse transcription PCR for quantitation of viral RNA (qRT-PCR). The ViroCyt® Virus Counter (VC) 2100 (ViroCyt, Boulder, CO, USA) is a flow-based instrument capable of quantifying virus particles in solution. Using a proprietary combination of fluorescent dyes that stain both nucleic acid and protein in a single 30 min step, rapid, reproducible, and cost-effective quantification of filovirus particles was demonstrated. Using a seed stock of Ebola virus variant Kikwit, the linear range of the instrument was determined to be 2.8E+06 to 1.0E+09 virus particles per mL with coefficient of variation ranging from 9.4% to 31.5% for samples tested in triplicate. VC particle counts for various filovirus stocks were within one log of TEM particle counts. A linear relationship was established between the plaque assay, qRT-PCR, and the VC. VC results significantly correlated with both plaque assay and qRT-PCR. These results demonstrated that the VC is an easy, fast, and consistent method to quantify filoviruses in stock preparations. View Full-Text
Keywords: ViroCyt® Virus Counter; filovirus; quantitation; qRT-PCR; TEM; plaque assay ViroCyt® Virus Counter; filovirus; quantitation; qRT-PCR; TEM; plaque assay
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Rossi, C.A.; Kearney, B.J.; Olschner, S.P.; Williams, P.L.; Robinson, C.G.; Heinrich, M.L.; Zovanyi, A.M.; Ingram, M.F.; Norwood, D.A.; Schoepp, R.J. Evaluation of ViroCyt® Virus Counter for Rapid Filovirus Quantitation. Viruses 2015, 7, 857-872.

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