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GEN Protocols


Viral Titer Assays and Interpretations

Date: February 28, 2022, 11:00 am - 12:00 pm ET

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In this Mixer we will discuss some common methods used to measure viral titers and considerations one should bear in mind when interpreting the results from different assays used to quantify virus particles.

Along with all things virology, the recent pandemic has led to focused interest in the accurate quantification of viruses in cell and tissue samples. However, quantifying viruses is a routine and necessary assay for researchers studying infectious disease, pathogenesis, vaccine development, cell and gene therapy and well and basic biology. For instance, cellular models with a specific gene or a set of genes over-expressed, under-expressed or not expressed altogether are developed routinely in labs by infecting cells with constitutive or inducible lentivirus vectors. Determining the virus titer before infecting cells allows researchers to control the number of virus particles added per cell during infection. Various methods are used to measure viral titers. Virus titers can be functional (infectious) or physical and are measured in viral particles per unit volume. There are various commercially available kits that measure virus titers based on different principles and are best suited for specific downstream applications, such as antibody neutralization, ELISA-based neutralization, antiviral therapeutic discovery, cytopathic effect (CPE), or lentiviral transduction for gene or cell therapy. The traditional measurement of viral titers is laborious, subjective and the data points are often limited due to manual experimentation.

A live Q&A session will follow the presentations, offering you a chance to pose questions to our expert panelists. Please enter your questions for the speaker in the Q&A box on your screen at any time during the session.


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Hosted by:

Anjali A. Sarkar, Ph.D.

Science Editor, GEN, GEN Protocols

A'Drian Pineda is the Senior Business Development Manager for digital PCR (dPCR) at QIAGEN, supporting the North American BioPharma market. Before joining QIAGEN, he spent 6 years as a Field Application Scientist and Manager specializing in support for BioPharma and ddPCR customers in R&D, AD and GMP manufacturing. Previous roles include work with viral vectored gene therapies, vaccines, cell line development and process development, most recently at Novartis and GSK. A’Drian earned his M.Sc. from Vanderbilt University in Nashville, TN.