Virus Analytics

Rapid Virus Quantification

Products from ViroCyt, now part of Sartorius Stedim Biotech, are leading the field of rapid virus quantification. Our goal is to provide the tools that deliver meaningful improvements to mission critical processes, where viruses play a significant role.

Virus Counter® 3100 platform is purpose build to rapidly and precisely quantify total virus particles in process development and manufacturing processes.

  • Accelerate time-to-result and time-to-market for vaccines and viral therapies.
  • Speed up development times with real-time titer insights.
  • Increase product safety and quality by in-depth sample characterization.


  • Vaccine production
  • Protein expression
  • Viral therapeutics
  • Antiviral development

Our virus quantification products offer a new approach to enable direct, biologically-specific quantification of viruses in minutes, rather than the days or weeks required by more traditional methods. Virus samples are labeled with specifically-developed reagents in a no-wash assay. The purpose-build platform enables quantification of total virus particles in three minutes per the sample, giving users real-time insights into viral titers.

Meet The Virus Counter® Platform: The Powerful Tool for Rapid Virus Quantification

The Virus Counter® Platform is in use by leading companies, regulatory agencies, and research agencies around the world. Why? A growing body of evidence demonstrates that noninfective particles are of biological importance and can impact both in vitro and in vivo studies. Infectivity and total particle concentration are essential for in-depth sample characterization.

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Vaccine Process Development and Manufacturing

Racing for a Viable Vaccine: Expediting Vaccine Development Amidst a Pandemic

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Discover Latest Results Obtained for Coronaviridae Quantification

Download the poster on rapid total viral particle quantification for viral families.

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The Virus Counter Platform Delivers More of What Matters When Quantifying Viruses

  • Speed - Real-time quantification for process monitoring and production optimization
  • Biologically-relevant readout – Total viral particle quantification
  • Versatility - High-specificity and universal quantification reagents
  • Ease of use – software-assisted system operation (including 21CFR Part 11 capabilities)
  • Reliability – Rugged design for industrial settings, easy system maintenance

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Our Virotag® Reagents – The Right Quantification Solution for Everyone

Virotag® reagents utilize a simple, no-wash protocol for optimal staining of your virus of interest. This allows for rapid, direct, and precise quantification of viruses using the Virus Counter® platform.
Now available: The new Virotag® DY ENV reagent is a ready-to-use and universal quantification solution for all enveloped viruses.

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Simple, No-Wash Assay

The Virotag® labeling system uses a rapid, no wash-assay workflow.

With the Virus Counter® 3100 platform, use this rapid, no wash labeling procedure and take virus quantification to new levels of accuracy, speed and simplicity.

The Impact of Rapid Virus Quantification - BPI Webcast

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Quantifying Viruses? Here's What Matters Most!

In her Q&A with BioPharm International, Antje Schickert, Product Manager Virus Analytics at Sartorius Stedim Biotech, explains how our Virus Counter Platform makes even the trickiest virus enumerations count!

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Virus clearance validation services

Confidence® Virus Clearance Services: Quicker LRV Results

Validate the viral reduction performance of Virosart® HF with our Confidence® Services: Highly purified viruses and expert knowledge.

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Virus Counter Platform

Accelerate Vaccine Development With Rapid Total Particle Quantification

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