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Questions and Answers
Which specimen is NOT typically used for laboratory analysis in disease identification?
Which specimen is NOT typically used for laboratory analysis in disease identification?
- Sweat samples (correct)
- Lesion samples
- Throat swabs
- Sputum
From which of the following can laboratory specimens for analysis be obtained?
From which of the following can laboratory specimens for analysis be obtained?
- Nasal swabs
- Urine
- Saliva
- Blood (correct)
What type of sample is typically taken from a lesion for laboratory analysis?
What type of sample is typically taken from a lesion for laboratory analysis?
- Skin scrape
- Blood
- Saliva
- Pus (correct)
Which of the following is a form of specimen obtained for laboratory analysis in disease diagnosis?
Which of the following is a form of specimen obtained for laboratory analysis in disease diagnosis?
What is a potential source of specimens for laboratory analysis according to the form of the disease?
What is a potential source of specimens for laboratory analysis according to the form of the disease?
What is one major syndrome associated with S.pyogenes?
What is one major syndrome associated with S.pyogenes?
Which of the following conditions is NOT commonly associated with S.pyogenes?
Which of the following conditions is NOT commonly associated with S.pyogenes?
Which of the following can lead to cellulitis?
Which of the following can lead to cellulitis?
Which is a skin-related condition potentially caused by S.pyogenes?
Which is a skin-related condition potentially caused by S.pyogenes?
Among the listed conditions, which one is considered a syndrome caused by S.pyogenes?
Among the listed conditions, which one is considered a syndrome caused by S.pyogenes?
What effect does this toxin have on polymorphonuclear leukocytes?
What effect does this toxin have on polymorphonuclear leukocytes?
Which of the following diseases is associated with the bacteria producing this toxin?
Which of the following diseases is associated with the bacteria producing this toxin?
How does this toxin influence cytokine production?
How does this toxin influence cytokine production?
Which of the following processes is activated by the toxin?
Which of the following processes is activated by the toxin?
What impact does this toxin have on inflammation?
What impact does this toxin have on inflammation?
Which test detects a patient's antibody titer to Streptolysin O following a Group A Streptococcus infection?
Which test detects a patient's antibody titer to Streptolysin O following a Group A Streptococcus infection?
What characteristic distinguishes S.pyogenes from other streptococci?
What characteristic distinguishes S.pyogenes from other streptococci?
Which resistance property does S.pyogenes exhibit?
Which resistance property does S.pyogenes exhibit?
What is true about the sensitivity of S.pyogenes to bacitracin?
What is true about the sensitivity of S.pyogenes to bacitracin?
What does a positive ASO titer test indicate?
What does a positive ASO titer test indicate?
Which specimen is NOT suitable for laboratory evaluation in diagnosing S. pneumoniae?
Which specimen is NOT suitable for laboratory evaluation in diagnosing S. pneumoniae?
What type of colonies would be expected when S. pneumoniae is cultured under specific conditions?
What type of colonies would be expected when S. pneumoniae is cultured under specific conditions?
At what temperature should S. pneumoniae specimens be incubated for optimal culture results?
At what temperature should S. pneumoniae specimens be incubated for optimal culture results?
When performing laboratory evaluations for S. pneumoniae, which method is appropriate for obtaining specimens?
When performing laboratory evaluations for S. pneumoniae, which method is appropriate for obtaining specimens?
Which of the following methods is least likely to yield clinical specimens for the evaluation of S. pneumoniae?
Which of the following methods is least likely to yield clinical specimens for the evaluation of S. pneumoniae?
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Study Notes
Clinical Significance of Streptococcus pyogenes
- Streptococcus pyogenes (Group A Streptococcus, GAS) is a major cause of cellulitis.
- GAS causes a variety of infections, including:
- Acute pharyngitis or pharyngo-tonsillitis
- Impetigo
- Depending on the type of infection, specimens for laboratory analysis can be obtained from:
- Throat swabs
- Pus and lesion samples
- Sputum
- Blood
- Spinal fluid
- S. pyogenes is highly sensitive to bacitracin.
- S. pyogenes is catalase-negative and optochin resistant.
Clinical Significance of Streptococcus pneumoniae
- Streptococcus pneumoniae (pneumococcus) is the major cause of bacterial pneumonia.
- Specimens for laboratory analysis can be obtained from:
- Nasopharyngeal swab
- Blood
- Pus
- Sputum
- Spinal fluid
- S. pneumoniae produces alpha-hemolytic colonies when grown on blood agar at 37°C.
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