Sputum from a patient with a history of tuberculosis due to Mycobacterium tuberculosis bacteria is collected and sent to the microbiology lab for analysis. X-ray analysis and an acid-fast smear made from the sputum indicate that the patient has active tuberculosis. The physician has requested that the sputum be analyzed for pathogen load, but because colonies of Mycobacterium typically take between 3 to 8 weeks to appear on agar, results from traditional culture methods are often delayed. If you were the microbiologist in this case, what would you do? 

A. Set up a traditional culture on the sputum, then use the colonies for real-time PCR with primers to Mycobacterium tuberculosis DNA to quantify the pathogen load.
B. Using the sputum, apply real-time PCR with primers to Mycobacterium tuberculosis DNA to estimate the pathogen load, then follow up with a traditional culture. 
C. Set up a traditional culture on the sputum, then use the colonies for end-point PCR with primers to Mycobacterium tuberculosis DNA to quantify the pathogen load.
D. Using the sputum, apply end-point PCR with primers to Mycobacterium tuberculosis DNA to estimate the pathogen load, then follow up with a traditional culture.


Answer: B

Biology & Microbiology

You might also like to view...

Chloroplasts are the site for both the light and dark reactions of photosynthesis.

Answer the following statement true (T) or false (F)

Biology & Microbiology

While looking for evidence of early human or humanlike individuals, you discover a cave in which

there are paintings, engravings, and sculptures. Which of the following most likely lived in the cave at some time during their life? a. Australopithecus africanus b. Neandertals c. Homo erectus d. Cro-Magnons e. Homo habilis

Biology & Microbiology

Which of the following accurately describes the sequence of tissues from the pith outward to the cork in a woody stem?

a. Secondary xylem, primary xylem, vascular cambium, cortex, primary phloem, secondary phloem, and cork cambium b. Primary xylem, secondary xylem, vascular cambium, secondary phloem, primary phloem, cortex, and cork cambium c. Primary xylem, secondary xylem, secondary phloem, primary phloem, cork cambium, cortex, and vascular cambium d. Primary xylem, secondary xylem, vascular cambium, primary phloem, secondary phloem, cortex, and cork cambium e. Cortex, secondary xylem, primary xylem, vascular cambium, primary phloem, secondary phloem, and cork cambium

Biology & Microbiology

Which of the following is NOT a characteristic of viruses?

A) They are visible with a light microscope. B) They are acellular. C) They are composed of genetic material and protein. D) They are typically smaller than prokaryotic cells. E) They are obligatory parasites.

Biology & Microbiology