You are given a series of 6 tubes. In the first tube is 4.5…
You are given a series of 6 tubes. In the first tube is 4.5 mL of saline. In each of the following tubes is 6 mL of saline. 0.5 mL of serum is added to the first tube and 2 mL of this is then transferred to each of the following tubes. The final 2 mL is discarded. The total (substance) dilution in tube #3 is:
Read DetailsTo deterimine the accuracy of the hair-perforation test for…
To deterimine the accuracy of the hair-perforation test for Trichophyton species, the clinical laboratory scientist used a known positive culture in parallel with the patient specimen. The culture dish of the control should contain baby hair plus which of the following?
Read DetailsAn acid-fast bacillus from a sputum specimen grows on Lowens…
An acid-fast bacillus from a sputum specimen grows on Lowenstein-Jensen medium in 12 days as pale buff colonies. A light test is performed after which there appears to be no color change. The isolate is niacin positive, nitrate positive and tellurite negative. What is the likely identification of the isolate?
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