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Why can a plaque be used when determining the number of phages present in a solution?

Why can a plaque be used when determining the number of phages present in a solution?

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The plaque is generally used to determine the number of phages present in a solution. Because counting the numbet of phages in a solution is a cumbersome task. There are found large number of phages in the solution. So, we dilute our culture so that countable plaque can be obtained on plate having bacteria. This countable range is 30-300

Hence it becomes an easy task to count the phages by this method.

Phages in a solution= [Number of plaque/(volume plated× dilution)]

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