So, you've harvested your lentiviruses and are ready to infect your cells! Hold on a minute - do you know how many lentiviral particles you have? It's time to calculate your lentivirus titer!

In this fourth video of our lentivirus series we'll show you various methods for determining viral titer. This video covers:
• Functional vs. Physical Titer
• How to determine functional titer: FACS, Colony Formation Assay, qPCR
• How to determine physical titer: p24 ELISA, qRT-PCR
• Which titering method you should use
• How to calculate titer

There are two different types of titer measurements: functional and physical titer. Functional titer measures how many viral particles are actually able to infect cells, whereas physical titer simply measures how many total viral particles there are, both functional and non-functional.

Calculating viral titer is a foundational skill for every cell biology lab and we hope our video helps you plan your own viral titering experiment with confidence!

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