What was the concentration of bacteria (CFU/mL) in the original suspensions used for dilutions and plating below:  Dilution Amount plated # of colonies counted 10-4 1.0 mL 271 10-5 0.1 mL 36 10-6 1.0 mL 9

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Q: How many bacteria would be in 1ml of the sample if you counted 134 colonies on the 1:1,000 dilution?

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Q: Why is skin contamination such a big problem in blood culture test?

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