When viable cell concentrations are too high to count on an agar plate, it is common to use larger sized plates to increase the surface area for counting the colonies.

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When viable cell concentrations are too high to count on an agar plate, it is not common to use larger sized plates. Instead, dilution methods such as serial dilution or most probable number method are utilized to estimate the viable cell count.

When Viable Cell Concentrations Are Too High to Count on an Agar