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- You counted 40 colonies on a plate in your dilution series. The plate was inoculated with 1.0ml from a 10-7 test tube, what is the OCD?..
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- Why is skin contamination such a big problem in blood culture test?Does the unknown sample contain HCG? how did you know ? what is the purpose of positive and negative control test?A plate has 72 colonies with a total dilution factor of 10-7, 0.1 ml was pipetted onto the plate, what was the original CFU/ml concentration of that sample?
- Why was it necessary to also test the patients for HBV and HIV? Why is it a mistake to use the same syringe, even with a new, sterile needle?You have performed a serial dilution of an unknown sample and counted 73 CFU on a countable plate that was marked at 10^-4 dilution and you used 0.1 mL to inoculate the plate. What is the population of the original sample?what would you conclude if an inoculated plate had colonies between the streak lines
- What test must be performed as a resault of the needle stick?What is this type of test called? What specific antigen did we use it for? What organism was identified with the test? How did you know it was positive? How did you know it was negative? How did you know the test was valid?What part of the test tube changes color first (in Resazurin Reduction Test)?
- If there is a sample having 3.5x10^5 CFU/ml, and this cell count came from a sample of the original culture which had been diluted 1x10^-4 times, what is the number of CFU/ml of the original culture?What is a better alternative to the plate count method?Why should the specimen be albumin free when performing the chloride test for urine?