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if a 10-3 virus dilution put on agar using the methods you will read about (and...

if a 10-3 virus dilution put on agar using the methods you will read about (and would have used) in the lab manual resulted in > 2000 plaques (which really are not countable as they are too crowded) on the final agar plate; and the 10-4 virus dilution gave you 200 plaques; and the 10-5 virus suspension dilution gave you 20 plaques, you need to then figure out what your final dilution factor was and use that to calculate the virus titer (i.e., the number of virus particles per ml) in the ORIGINAL suspension.

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