In a paper recently I saw "Cell are infected with 50,000 IU of virus per 100ul well". I can not seem to find a defintion of this unit? Is it a functional unit or just a count? If someone is familiar with this definition please let me know.

It is a retrovirus. The thesis is here (page 18): https://tspace.library.utoronto.ca/bitstream/1807/98170/3/Mazzanti_Andrew_D_201911_MSc_thesis.pdf

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    $\begingroup$ IU usually stands for "International Units". It can be functional of just a count. You'd have to search specifically for the meaning of IU for viruses to know what number of viruses per 100ul tat specifies. $\endgroup$ – anongoodnurse Feb 11 at 16:53

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