Abstract

Many bacteriologic studies, including cellular invasion and adherence assays, require enumeration of viable organisms or colony forming units. When attempting to screen large numbers of clinical or environmental isolates or laboratory-derived mutants for differences in invasion or adherence phenotype, standard plating methods can be cumbersome and severely limit the number of organisms or conditions which can be tested. As a potential alternative, we describe a simple, rapid and inexpensive soft agar-based technique for semi-quantitative determination of bacterial colony counts directly within the wells of a 96-well microtiter plate.

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