A darkfield microscope would be useful in examining blood for_______________?
Correct answer: A. Treponema
- A. Treponema
- B. Actinomyces
- C. Streptococcus
- D. Mycobacterium
Explanation
Treponema pallidum is a thin, motile spirochaete that is difficult to see with ordinary bright-field microscopy, so dark-field microscopy is used to visualize it. Actinomyces, Streptococcus, and Mycobacterium are generally examined by other staining or culture methods.
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