Podcast
Questions and Answers
What method is used to confirm a diagnosis of diphtheria?
What method is used to confirm a diagnosis of diphtheria?
Listeria monocytogenes has which notable characteristic?
Listeria monocytogenes has which notable characteristic?
Which one of the following does N.meningitidis exhibit, but not N.gonorrhoeae?
Which one of the following does N.meningitidis exhibit, but not N.gonorrhoeae?
Which characteristic is NOT associated with Listeria monocytogenes?
Which characteristic is NOT associated with Listeria monocytogenes?
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Which method confirms the presence of toxin production by a suspicious isolate in diphtheria diagnosis?
Which method confirms the presence of toxin production by a suspicious isolate in diphtheria diagnosis?
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Study Notes
Diagnostic Methods for Diphtheria
- A diagnosis of diphtheria is confirmed by microscopic examination of organisms stained with methylene blue
- Isolation of a typical colony on Tinsdale's agar is another method of confirmation
- Invasive nature of the disease can be demonstrated by isolating typical organisms from materials such as blood
- Detection of "phage plagues" in cultures of suspicious isolates is also a diagnostic method
- Demonstration of toxin production by a suspicious isolate is a key diagnostic feature
Characteristics of Listeria monocytogenes
- Listeria monocytogenes can grow at refrigerator temperatures (4°C)
- It is an intracellular pathogen, not an extracellular one
- The bacterium is catalase-positive
- Listeria monocytogenes is a gram-positive rod, not a coccus
- It is a zoonotic pathogen, not strictly a human pathogen
Characteristics of Neisseria meningitidis
- Neisseria meningitidis ferments glucose, a characteristic that distinguishes it from Neisseria gonorrhoeae
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Description
Test your knowledge of microbiology with these questions on diagnosing bacterial infections, including diphtheria and Listeria monocytogenes.
