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Questions and Answers
Which of the following options are catalase-negative Gram-positive spherical or oval cocci, that grow well on blood agar, and are lactic acid bacteria?
Which of the following options are catalase-negative Gram-positive spherical or oval cocci, that grow well on blood agar, and are lactic acid bacteria?
- Staphylococci
- Streptococci
- None of them
- Lactobacilli (correct)
Staphylococcus aureus is:
Staphylococcus aureus is:
- Coagulase negative
- Catalase negative
- Coagulase positive (correct)
- None of them
The microorganism that causes tonsillitis and pharyngitis, scarlet fever, otitis media, and impetigo is:
The microorganism that causes tonsillitis and pharyngitis, scarlet fever, otitis media, and impetigo is:
- Streptococcus mutans
- Streptococus piogenes
- S. agalactiae
- Streptococcus pyogenes (correct)
Which of the following options are not catalase-negative Gram-positive spherical or oval cocci?
Which of the following options are not catalase-negative Gram-positive spherical or oval cocci?
Which of the following is true about Streptococcus mutans?
Which of the following is true about Streptococcus mutans?
What is the characteristic hemolytic reaction of Streptococcus?
What is the characteristic hemolytic reaction of Streptococcus?
What is the family classification of Streptococcus?
What is the family classification of Streptococcus?
What is the characteristic size of Gram-positive spherical or oval cocci of Streptococcus?
What is the characteristic size of Gram-positive spherical or oval cocci of Streptococcus?
Which of the following is a characteristic of Staphylococci?
Which of the following is a characteristic of Staphylococci?
Which of the following is a characteristic of Streptococci mutans group bacteria?
Which of the following is a characteristic of Streptococci mutans group bacteria?
Which of the following is a characteristic of Lancefield group A?
Which of the following is a characteristic of Lancefield group A?
Which of the following bacteria is associated with endodontic treatment failure?
Which of the following bacteria is associated with endodontic treatment failure?
Which bacteria is a common pathogen causing localized skin and serious systemic infections?
Which bacteria is a common pathogen causing localized skin and serious systemic infections?
Which bacteria is associated with catheter-related tract sepsis, artificial joints, and urinary infections?
Which bacteria is associated with catheter-related tract sepsis, artificial joints, and urinary infections?
Which of the following bacteria causes neonatal meningitis and sepsis?
Which of the following bacteria causes neonatal meningitis and sepsis?
Which of the following bacteria is a normal constituent of microbiota?
Which of the following bacteria is a normal constituent of microbiota?
Which of the following bacteria spreads by contact and is associated with catheter-related tract sepsis, artificial joints, and urinary infections?
Which of the following bacteria spreads by contact and is associated with catheter-related tract sepsis, artificial joints, and urinary infections?
Which of the following bacteria causes infections like tonsillitis, pharyngitis, and rheumatic fever?
Which of the following bacteria causes infections like tonsillitis, pharyngitis, and rheumatic fever?
Which of the following bacteria is a major agent of dental caries?
Which of the following bacteria is a major agent of dental caries?
Which of the following bacteria can be classified by the degree of haemolysis on blood agar and the cell wall carbohydrate antigens into Lancefield groups?
Which of the following bacteria can be classified by the degree of haemolysis on blood agar and the cell wall carbohydrate antigens into Lancefield groups?
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Study Notes
Bacterial Classification and Characteristics
- Streptococci are Gram-positive bacteria, appearing as spherical or oval cocci in chains and pairs.
- Streptococci can be classified by the degree of haemolysis on blood agar and the cell wall carbohydrate antigens into Lancefield groups.
- Lancefield group A contains Streptococcus pyogenes, causing infections like tonsillitis, pharyngitis, and rheumatic fever.
- Oral streptococci are a mixed group, typically showing α-haemolysis on blood agar, and can be divided into four main species groups.
- The mutans group bacteria are major agents of dental caries.
- Staphylococci resemble streptococci in appearance but are arranged in grape-like clusters and are all catalase-positive.
- Staphylococcus aureus is a common pathogen causing localized skin and serious systemic infections, producing numerous toxins and enzymes as virulence factors.
- Antibiotic resistance in staphylococci has led to the emergence of methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Staphylococcus aureus (VRSA).
- Streptococcus pyogenes causes a number of infections, including scarlet fever, otitis media, and impetigo.
- Streptococcus agalactiae causes neonatal meningitis and sepsis.
- Enterococcus faecalis is a normal constituent of microbiota and is associated with endodontic treatment failure.
- Staphylococcus epidermidis spreads by contact and is associated with catheter-related tract sepsis, artificial joints, and urinary infections.
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