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22 March, 04:33

You are going to prepare an infectious dose of bacteria to run an experiment. this means you need a known concentration of bacteria that is capable of causing disease in your animal model. you complete a total direct cell count. is this an accurate count?

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  1. 22 March, 08:18
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    A total direct cell counting is a method commonly used to count the concentration of cells in a solution. The instruments used are a hemocytometer, a specialized slide, called counting chamber and a microscope. It is considered an accurate count since it is widely used. However, a disadvantage of these methods is that there can not be a differentiation between dead and live cells. This means that dead and live bacteria will both be measured and there will not be an accurate estimation of the infectious dose.
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