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Questions and Answers
Which characteristic defines a facultative anaerobe most accurately?
Which characteristic defines a facultative anaerobe most accurately?
- Can survive in either aerobic or anaerobic conditions. (correct)
- Requires oxygen for survival.
- Thrives only in conditions with high carbon dioxide concentrations.
- Cannot survive in the presence of oxygen.
How would you classify bacteria that appear in pairs when observed under a microscope?
How would you classify bacteria that appear in pairs when observed under a microscope?
- Diplococci (correct)
- Staphylococci
- Tetrads
- Streptococci
What is a key factor that contributes significantly to the pathogenicity of certain Staphylococcus species?
What is a key factor that contributes significantly to the pathogenicity of certain Staphylococcus species?
- Their requirement for aerobic conditions to survive.
- Their commensal relationship with the host.
- Their sensitivity to common antibiotics.
- Their ability to produce toxins and invade tissues. (correct)
Which of the following infections is least likely to be caused by Enterococcus?
Which of the following infections is least likely to be caused by Enterococcus?
Enterococcus exhibits a notable resistance to antibiotics. What classes of antibiotics are they known to resist?
Enterococcus exhibits a notable resistance to antibiotics. What classes of antibiotics are they known to resist?
What characteristic is most helpful in distinguishing Staphylococcus from other bacteria under a microscope?
What characteristic is most helpful in distinguishing Staphylococcus from other bacteria under a microscope?
Flashcards
Enterococci
Enterococci
Commensal bacteria in intestines, facultative anaerobic, occur in pairs or short chains.
Enterococci Infections
Enterococci Infections
Infections caused by Enterococci include urinary tract infections, bacteremia, endocarditis, diverticulitis, and meningitis.
Antibiotic Resistance in Enterococci
Antibiotic Resistance in Enterococci
Enterococci are highly resistant to antibiotics, including Beta-lactam and aminoglycosides.
Staphylococci
Staphylococci
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Pathogenic vs. Non-Pathogenic Staphylococci
Pathogenic vs. Non-Pathogenic Staphylococci
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S. aureus Infections
S. aureus Infections
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Study Notes
- Enterococci are common facultative anaerobic commensals of the intestines, appearing as diplococci or short chains.
- Can cause urinary tract infections, bacteremia, bacterial endocarditis, diverticulitis, and meningitis.
- Exhibit high antibiotic resistance, including to Beta-lactam and aminoglycoside antibiotics.
Staphylococcus
- Staphylococci are facultative anaerobic commensals of the skin and nares, appearing round and forming grape-like clusters.
- Most species are harmless, residing normally on skin and mucus membranes.
- Pathogenic species produce toxins or invade tissues to cause disease.
S. aureus
- Major cause of nosocomial and community-acquired infections.
Superficial skin infections
- Boils
- Furuncles
- Styes
- Impetigo
Serious infections in immunocompromised patients
- Pneumonia
- Deep abscesses
- Meningitis
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Description
Enterococci are facultative anaerobic commensals that can cause infections. Staphylococci are facultative anaerobic commensals of the skin and nares. S. aureus is a major cause of nosocomial and community-acquired infections, including skin infections and serious infections in immunocompromised patients.
