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How many colonies on a Petri dish are considered too numerous to count?

April 26, 2017colonies dish numerous petri

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How many colonies on a Petri dish are considered too numerous to count?

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A. If there are more than 200 colonies per plate, report this as “too numerous to count” TNTC since the colonies are not considered distinct enough for an accurate reading. You may need to consider a smaller sample size (1 mL or 3 mL) for your next monitoring event.