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Related Experiment Video

Updated: Jun 27, 2026

A Streamlined, Label-Free Real-Time 50% Tissue Culture Infectious Dose (TCID50) Assay using Impedance for Automated Viral Titer Quantification

A Streamlined, Label-Free Real-Time 50% Tissue Culture Infectious Dose (TCID50) Assay using Impedance for Automated Viral Titer Quantification

Published on: January 9, 2026

Calculating HIV-1 infectious titre using a virtual TCID(50) method.

Yong Gao¹, Immaculate Nankya, Awet Abraha

¹Division of Infectious Diseases, Department of Medicine, Case Western Reserve University, Cleveland, OH, USA.

Methods in Molecular Biology (Clifton, N.J.)

|November 21, 2008

Summary

A new virtual TCID(50) method offers a faster, cell-free way to measure infectious HIV-1 levels. This technique compares reverse transcriptase activity, providing results comparable to traditional methods for HIV research.

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Area of Science:

Virology
Molecular Biology
Immunology

Background:

Accurate quantification of infectious Human Immunodeficiency Virus type 1 (HIV-1) is crucial for studying viral replication and fitness.
The standard method, tissue culture dose for 50% infectivity (TCID(50)), is time-consuming and labor-intensive, requiring cell cultures and several weeks for results.

Purpose of the Study:

To develop and validate a rapid, cell-free surrogate method for measuring infectious HIV-1 titers.
To provide a more efficient alternative to the traditional TCID(50) assay for HIV-1 quantification.

Main Methods:

Introduction of the virtual TCID(50) technique, a novel cell-free assay.
Estimation of infectious titer by comparing reverse transcriptase (RT) activity in virus stocks to reference viruses with known TCID(50) values.

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Last Updated: Jun 27, 2026

A Streamlined, Label-Free Real-Time 50% Tissue Culture Infectious Dose (TCID50) Assay using Impedance for Automated Viral Titer Quantification

A Streamlined, Label-Free Real-Time 50% Tissue Culture Infectious Dose (TCID50) Assay using Impedance for Automated Viral Titer Quantification

Published on: January 9, 2026

Lentivirus Production

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Published on: October 2, 2009

Measurement of In Vitro Integration Activity of HIV-1 Preintegration Complexes

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Published on: February 22, 2017

Main Results:

The virtual TCID(50) values were found to be comparable to the actual infectious TCID(50) values.
The new method significantly simplifies the process of HIV-1 titration.

Conclusions:

The virtual TCID(50) technique provides a rapid and accurate cell-free method for quantifying infectious HIV-1.
This approach is particularly advantageous for high-throughput studies involving numerous HIV-1 isolates, accelerating research in HIV pathogenesis and therapeutic development.